对于⊙C与⊙C上的一点A,若平面内的点P满足:射线 AP与⊙C交于点Q(点Q可以与点P重合),且
,则点P称为点A关于⊙C的“生长点”.已知点O为坐标原点,⊙O的半径为1,点A(
1,0).
(1)若点P是点A关于⊙O的“生长点”,且点P在x轴上,请写出一个符合条件的点P的坐标 ;
(2)若点B是点A关于⊙O的“生长点”,且满足
,求点B的纵坐标t的取值范围;
(3)直线
与x轴交于点M,与y轴交于点N,若线段MN上存在点A关于⊙O的“生长点”,直接写出b的取值范围是 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c45c4dbbb8b3b771b6d30e2bf47bae9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b700fa9aeb1016aa71f76e4b6bb212e.png)
(1)若点P是点A关于⊙O的“生长点”,且点P在x轴上,请写出一个符合条件的点P的坐标 ;
(2)若点B是点A关于⊙O的“生长点”,且满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/857229c1d9e7a3f4cabfd1899db6ae07.png)
(3)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6f0ae39df8e525eeea2c415125ac1c8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/061274ce-f78d-40bb-bca2-c96bd0990d6b.png?resizew=408)
更新时间:2018-01-18 15:36:06
|
相似题推荐
解答题-问答题
|
困难
(0.15)
名校
【推荐1】如图,在平面直角坐标系中,已知直线
与直线
相交于点A,与
轴相交于点B,与
轴相交于点C,抛物线
经过点O、点A和点B,已知点A到
轴的距离等于2.
(1)求抛物线的解析式;
(2)点H为直线
上方抛物线上一动点,当点H到
的距离最大时,求点H的坐标;
(3)如图,P为射线OA的一个动点,点P从点O出发,沿着OA方向以每秒
个单位长度的速度移动,以OP为边在OA的上方作正方形OPMN,设正方形POMN与△OAC重叠的面积为S,设移动时间为t秒,直接写出S与t之间的函数关系式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bf2101c144a67a4684edec4c847cf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6337d68cd5653767e3a1889b8b2e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(1)求抛物线的解析式;
(2)点H为直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
(3)如图,P为射线OA的一个动点,点P从点O出发,沿着OA方向以每秒
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/16/6b337bc1-ce84-4ce1-bc8a-2c4bdb2ba088.png?resizew=513)
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解答题-计算题
|
困难
(0.15)
【推荐2】如图1,一次函数
的图像与
轴交于点
,与
轴交于点
,点
在
轴的正半轴上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/5/a44a184e-dc87-4726-8844-26cb7f2d50b8.png?resizew=335)
(1)求点
的坐标和直线
的函数表达式;
(2)如图2,设点
是
轴上的一个动点,过点
作
轴的平行线,交直线
于点
,交直线
于点
.
①当
的面积为
时,求点
的坐标;
②当
时,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b5062be5cf27ae8089ad0c25d1b7c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84acb42778406c1a60d818f6ca760366.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/5/a44a184e-dc87-4726-8844-26cb7f2d50b8.png?resizew=335)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)如图2,设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7a551505ae42b49904bab59b17012d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a391005600bdd69c96750589f9adb048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/715b680330163f38fcce0d741a4ce238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
名校
【推荐3】在平面直角坐标系中,直线
:
与x轴交于点B,直线
:
与x轴交于点C,直线
与
交于点A,点E是线段AC中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/9a0652f4-8c1f-4a6f-af75-653ffa56c596.png?resizew=413)
(1)填空:
______,
_____,点E的坐标为(_______,______);
(2)如图1,过点A作BC平行线交BE的延长线于点D,连接CD.
①求证:四边形ABCD是平行四边形;
②点P是直线AB上一点,是否存在直线OP将四边形ABCD分成面积相等的两部分?若存在,直接写出点P坐标,若不存在,请说明理由;
(3)将
沿x轴负方向平移得到
,其中点A,点B,点C的对应点分别为点
,点
,点
,在平移过程中直线
与y轴交点为M,点N为线段
延长线上一点,始终有
,连接MN与x轴交于点F,当
时直接写出点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aae342dcb93e0e6f017093cacc5ac977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ac26e96e88e534c9e868452d5082ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/9a0652f4-8c1f-4a6f-af75-653ffa56c596.png?resizew=413)
(1)填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
(2)如图1,过点A作BC平行线交BE的延长线于点D,连接CD.
①求证:四边形ABCD是平行四边形;
②点P是直线AB上一点,是否存在直线OP将四边形ABCD分成面积相等的两部分?若存在,直接写出点P坐标,若不存在,请说明理由;
(3)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4310db23fc79936c7182361e652bab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c686eaa6cf9bbbbe3d4369286221478.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adb77b189354ae954de0efbe3c8569f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐1】在平面直角坐标系
中,
的半径为
,点
是
上一点.对平面内的一点
,先将点
关于点
作中心对称变换得到点
,再将点
沿射线
的方向平移半径
的长度得到点
,称为一次关于半径
的反射平移,点
称为点
关于半径
的反射平移点.如图,已知点
.
是
上的动点,
,则在
,
,
,
中,可能是点
关于半径
的反射平移点的是________;
(2)直线
:
与
轴交于点
,与
轴交于点
.
①当
经过点
,且
的坐标为
时,若线段
上一点
关于半径
的反射平移点在
上或内部,直接写出点
的横坐标
的取值范围;
②当直线
经过点
,且
在
轴的正半轴上时,若线段
上存在点
,使点
关于半径
的反射平移点在
上,求
的半径
的取值范围;
(3)
的半径为1.若对于过点
的线段
上每一点
(不含端点),都存在位于第一象限的点
,使点
关于半径
的平移反射点恰好在
上,直接写出线段
长度的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a86380a6d6501f6504dcb4aa5e3099f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a86380a6d6501f6504dcb4aa5e3099f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eae863e7a1f1fed09f1075de4a817c63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eae863e7a1f1fed09f1075de4a817c63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baaf13627819890607661d8eb55efa83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9934cf2feb65b00392ba39d8242e47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f24f9d9599e52e36a6c0927bad790f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03618a9fe716efe4bba0d6fb10ae908d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7ea9519ac8f9f1322e32666aeb19577.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83558b0254d8de30cd9762f74fcce404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/217489d17e54d8c84bc89a2895f27fc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4fd84394e897ebf6c4814b841d427b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0189322d31e9b630ab0c0df14aa030a0.png)
②当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
名校
【推荐2】在平面直角坐标系
中,对于两个点
,
和图形
,如果在图形
上存在点
,
(
,
可以重合)使得
,那么称点
与点
是图形
的一对平衡点.
(1)已知
的半径为
,点
的坐标为
.若点
在第一象限,且点
与点
是
的一对平衡点,求
的取值范围;
(2)已知点
,以点
为圆心,
长为半径画弧交
的正半轴于点
.点
(其中
)是坐标平面内一个动点,且
,
是以点
为圆心,半径为
的圆,若
上的任意两个点都是
的一对平衡点,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa60af8a0b0a4c748e50f8b677677183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b569572c8d9bf05d78d3ab741e68bb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/812367a7a669dd720d2f1628e2fdb019.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d25339f9fb760f79096c085b3ee38f23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4cd68cc82e90a5e2049a7ea3171b84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad0f00d7f0acc53d9774923580a60bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90e8d5d7fed033f48270b1ff825fcd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f42f56b246c0eecf454c6ca8f956fb04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c38d239445fb31536dc29e518a7d0e76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
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解答题-证明题
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困难
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【推荐1】等腰Rt△ABC和等腰Rt△DBE中,∠D=∠A=90°,点M,N分别是BD,AB的中点,连接MN,CE.
![](https://img.xkw.com/dksih/QBM/2022/4/22/2963845107572736/2965653105647616/STEM/b373ada2-f9bc-446e-a0cc-c32d35a69e38.png?resizew=646)
(1)如图1,当点E在AB上时,直接写出MN与EC之间的数量关系: ;
(2)如图2,当点E不在AB上时,(1)的结论是否成立?若成立,请证明你的结论;若不成立,说明理由;
(3)如图3,点G是BC的中点,点D在直线NG上时,当点C、E、D三点共线时,请直接写出
的值.
![](https://img.xkw.com/dksih/QBM/2022/4/22/2963845107572736/2965653105647616/STEM/b373ada2-f9bc-446e-a0cc-c32d35a69e38.png?resizew=646)
(1)如图1,当点E在AB上时,直接写出MN与EC之间的数量关系: ;
(2)如图2,当点E不在AB上时,(1)的结论是否成立?若成立,请证明你的结论;若不成立,说明理由;
(3)如图3,点G是BC的中点,点D在直线NG上时,当点C、E、D三点共线时,请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a144c329440f29fed5d3c490c7796de.png)
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【推荐2】综合与实践课上,老师让同学们用“木工尺”探究三等分任意角
的方法.如图1为“木工尺”示意图,它是由两条宽度相同且互相垂直的直尺组成的,其中
.下面是同学们的探究过程,请仔细阅读,并完成相应的任务,
【操作实践】
如图2,小明画
的平行线
,使得
与
的距离等于尺宽
,在
上取点E,使
等于尺宽
,调整“木工尺”的位置,使得
经过点O,点D落在
上,点E落在
上, 则
三等分 ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5203d7f11145de49493ea46981fb648.png)
,垂足为点 F,
由题意得:
,
∴
( ).
∵
,
∴
垂直平分
,
∴
,
∴
平分
( ),
∴
.
∴
.
∴
三等分
.
任务:(1)请在括号内填写推理的依据.
【类比迁移】
爱动脑筋的小华受到上述方法的启发,想到了通过折叠矩形纸片三等分一个已知角的方法,他的前两个操作步骤如下 (如图 3):
上折出任意角
,将矩形
对折, 折痕记为
, 再将矩形
对折, 折痕记为
, 展开矩形;
步骤 2:将矩形
沿着
折叠, 使得点 B 的对应点
落在
上, 点 M 的对应点
落在
上.
任务:(2)连接
, 试证明
是
的一条三等分线.
【拓展应用】(3)在上述小华折叠的条件下,若
,且
三点共线,请直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a4ca8b43c0848f78b5ef191d253bec.png)
【操作实践】
如图2,小明画
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/641503ac697828ac611bfaf566f07014.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5203d7f11145de49493ea46981fb648.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86b66ebe83cb71e92f31ed8d8669c23d.png)
由题意得:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54fb5c852080da596aad2b0988c65b98.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b4d802c174cd2e56bf1c8509d467d95.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0213b6f997ef617d550f52b00f71542.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3aa1da9eef031c9562154530cbafb33.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15886bb1365d039d8e4450cae287788d.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dabd25adff7cac55821a7d2a35f025c8.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c3d550b0181d0d4faeb93d9270a2e58.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/641503ac697828ac611bfaf566f07014.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
任务:(1)请在括号内填写推理的依据.
【类比迁移】
爱动脑筋的小华受到上述方法的启发,想到了通过折叠矩形纸片三等分一个已知角的方法,他的前两个操作步骤如下 (如图 3):
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d29e7c4d6216690152430b09f9cf0c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3faf171916f7a730fd124542294df9ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7af6b531f532eb39c26d36e9dd97254d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
步骤 2:将矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da895d8bd043625a0839128252130d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
任务:(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79cd9d0d73549e2944578f3513631ce5.png)
【拓展应用】(3)在上述小华折叠的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea5c59c4b31a9ba0af06c7cdcc5fb991.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d1ac1d3fcdd70a8a7fd174079270028.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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解答题-问答题
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困难
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解题方法
【推荐1】如图1,经过点B(1,0)的抛物线
与y轴交于点C,其顶点为点G,过点C作y轴的垂线交抛物线对称轴于点D,线段CO上有一动点M,连接DM、DG.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/15/aafe3b0e-55f3-4a59-a113-1385fd84ad1a.png?resizew=385)
(1)求抛物线的表达式;
(2)求
的最小值以及相应的点M的坐标;
(3)如图2,在(2)的条件下,以点A(﹣2,0)为圆心,以AM长为半径作圆交x轴正半轴于点E.在y轴正半轴上有一动点P,直线PF与⊙A相切于点F,连接EF交y轴于点N,当PF∥BM时,求PN的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c99af257b47e2c165aafbd9011291d0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/15/aafe3b0e-55f3-4a59-a113-1385fd84ad1a.png?resizew=385)
(1)求抛物线的表达式;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75144a0bab84567b2f9bd43f05c4e52d.png)
(3)如图2,在(2)的条件下,以点A(﹣2,0)为圆心,以AM长为半径作圆交x轴正半轴于点E.在y轴正半轴上有一动点P,直线PF与⊙A相切于点F,连接EF交y轴于点N,当PF∥BM时,求PN的长.
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名校
解题方法
【推荐2】如图,
ABC是等边三角形,
BDE是顶角为120°的等腰三角形,BD=DE,连接CD,AE.
(1)如图1,连接AD,若∠ABE=60°,AB=BE=
,求CD的长;
(2)如图2,若点F是AE的中点,连接CF,DF.求证:CD=2DF;
(3)如图3,在(2)的条件下,若AB=2
,BD=2,将
BDE绕点B旋转,点H是
AFC内部的一点,当DF最大时,请直接写出2HA+HF+
HC的最小值的平方.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(1)如图1,连接AD,若∠ABE=60°,AB=BE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(2)如图2,若点F是AE的中点,连接CF,DF.求证:CD=2DF;
(3)如图3,在(2)的条件下,若AB=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://img.xkw.com/dksih/QBM/2021/4/10/2696610377916416/2699603938033664/STEM/716f0021-73ef-4427-9659-dbbe6167a75e.png)
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