1 . 在△ABC中,AB=AC,∠BAC=120°,以CA为边在∠ACB的另一侧作∠ACM=∠ACB,点D为射线BC上任意一点,在射线CM上截取CE=BD,连接AD、DE、AE.
(1)如图1,当点D落在线段BC的延长线上时,求∠ADE的度数;
(2)如图2,当点D落在线段BC(不含边界)上时,AC与DE交于点F,试问∠ADE的度数是否发生变化?如果不变化,请给出理由;如果变化了,请求出∠ADE的度数;
(3)在(2)的条件下,若AB=6,求CF的最大值.
(1)如图1,当点D落在线段BC的延长线上时,求∠ADE的度数;
(2)如图2,当点D落在线段BC(不含边界)上时,AC与DE交于点F,试问∠ADE的度数是否发生变化?如果不变化,请给出理由;如果变化了,请求出∠ADE的度数;
(3)在(2)的条件下,若AB=6,求CF的最大值.
![](https://img.xkw.com/dksih/QBM/2020/7/9/2502307438288896/2502850281070592/STEM/0ffc7ca457ae46f59e80dcda8c513b00.png?resizew=376)
您最近一年使用:0次
2 . 如图,直线
与
轴、
轴分别相交于
、
两点,抛物线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/103a1a7a348f87d89ec89af9e1bb3328.png)
经过点
,交
轴正半轴于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/10/a6b98688-055e-4cf2-94d2-1fee95c85e63.png?resizew=298)
(1)求该抛物线的函数表达式;
(2)已知点
是抛物线上的一个动点,并且点
在第一象限内,连接
、
,设点
的横坐标为
,
的面积为
,求
与
的函数表达式,并求出
的最大值及此时动点
的坐标;
(3)将点
绕原点旋转得点
,连接
、
,在旋转过程中,一动点
从点
出发,沿线段
以每秒
个单位的速度运动到
,再沿线段
以每秒
个单位长度的速度运动到
后停止,求点
在整个运动过程中用时最少是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc6f2dede1bb4e23ad8d5a9059d5192f.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/103a1a7a348f87d89ec89af9e1bb3328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/396f2055f52c0c2ce16a6d456df2ae51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/10/a6b98688-055e-4cf2-94d2-1fee95c85e63.png?resizew=298)
(1)求该抛物线的函数表达式;
(2)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4201d3bead2e48cc80052b1418f23db9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(3)将点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a037b1a3ec2e37bbcb05d0a467efb511.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12daf5fea89631b84f896939c503d88a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12daf5fea89631b84f896939c503d88a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
您最近一年使用:0次
3 . 如图,在
中,
,在
的外部和内部(不在边上)分别取一点
,
,若
,
,
,
的补角等于
,
则下列结论:
①点
在线段
的垂直平分线上;②
;
③
;④
的最大值是14.
其中正确的结论是_________ .(填写所有正确结论的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fffa3d9c32da53b0ea0c338012ea20c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.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/ffdfaf8ba10c7a0250437f4a317c5f44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d71e6ea7333dbc78d0a7b9bc3892f940.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0761165f1176f3a5fe4f7b052832316d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5157b42da58d55daad27d98b2fec15ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35803969509655f72b4118503ae1c966.png)
则下列结论:
①点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdb6e71754d3e73fb4939ee00f24ab9c.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d27beebe45dba8f91743aab21f15b39b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
其中正确的结论是
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/24/b1e882c9-5def-44a5-aa68-d1d03275c01b.png?resizew=238)
您最近一年使用:0次
解题方法
4 . 抛物线
交
轴于
两点,交
轴于点
,点
为线段
下方抛物线上一动点,连接
.
![](https://img.xkw.com/dksih/QBM/2020/7/2/2497043290292224/2497327257870336/STEM/9785c080f1244af9944b8d2df4db5e8b.png?resizew=519)
(1)求抛物线解析式;
(2)在点
移动过程中,
的面积是否存在最大值?若存在,求出最大面积及点
的坐标,若不存在,请说明理由;
(3)设点
为
上不与端点重合的一动点,过点
作线段
的垂线,交抛物线于点
,若
与
相似,请直接写出点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a0d44326c214c7a5ecc3068a29ec96f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421cb4c08784b75a8db77cb8c081f75a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/0d9ea82fbf17dc33c55abb9d460b37be.png)
![](https://img.xkw.com/dksih/QBM/2020/7/2/2497043290292224/2497327257870336/STEM/9785c080f1244af9944b8d2df4db5e8b.png?resizew=519)
(1)求抛物线解析式;
(2)在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d4e2e2810930822351578f6df08a352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bd3b58d32346a8d31bc90adc67d37b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4962343ca7d065aee473dbf79eb8d3c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
您最近一年使用:0次
5 . 如图,正方形
中,
,
,点
在
上运动(不与
重合),过点
作
交
于点
,则
的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7949a50146e4db34087db056c4de2683.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/12eb814bb12c2e8d3c6de69a73e972ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c666d543c79d9054fc2614685ccec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/6/ad9e674d-e15f-4a06-a8b2-dde3722cbeab.png?resizew=147)
A.3 | B.4 | C.2 | D.1 |
您最近一年使用:0次
6 . 如图,已知
,
为
上一动点(不与
、
)重合,分别以
、
为边在
的上方作等边
和等边
,连接
、
、
、
,且
、
相交于点
.有下列结论:①
;②
;③
平分
;④
外接圆面积的最小值为
.其中所有正确结论的序号是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/29/fd68a53f-9087-4568-a48f-c581c936fdb1.png?resizew=164)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d55c5bb2839260d1b0d7cd97e1812bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2435d796d3284b1da616ef7cd84eded9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/29/fd68a53f-9087-4568-a48f-c581c936fdb1.png?resizew=164)
A.①② | B.①②③ | C.①②④ | D.①②③④ |
您最近一年使用:0次
7 . 如图,抛物线
与x轴交于A、B两点,与y轴交于点C,直线
过B、C两点,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/74af511b-d142-4ce5-a150-d6b0e12ed5b9.png?resizew=200)
(1)求抛物线的解析式;
(2)求证:
;
(3)抛物线对称轴上是否存在点P使得
的最小值,若存在,求出点P坐标,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c9800e4b992044d16681e77ff6563c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc9118cc77fc0a045337745890e50cad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/74af511b-d142-4ce5-a150-d6b0e12ed5b9.png?resizew=200)
(1)求抛物线的解析式;
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/767bcca107034191460cd6fe3f17e7bf.png)
(3)抛物线对称轴上是否存在点P使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1441093334b71f88954eed46804c316c.png)
您最近一年使用:0次
8 . 如图 ,平面直角坐标系中,
,M、N两点分别在线段
、y轴上,则
的最小值为__________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb3a3a32f72a5eadab707bf737d8d789.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66711e95cc78503767f13b9f07c2e22f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/23/b36030c4-9771-40aa-9272-efc8e7418acf.png?resizew=169)
您最近一年使用:0次
9 . 如图,在矩形
中,
,
,E是
的中点,F是线段
上的一点,连接
,把
沿
折叠,使点B落在点G处,连接
,
的延长线交线段
于点H.给出下列判断:①
;②
;③当
时,
的长度是
④线段
长度的最小值是
;⑤当点G落在矩形
的对角线上,
的长度是3或
;其中正确的是________ .(写出所有正确判断的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d4746df85049d1651d3f6c30212a7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eca7e1a727ba332984ad857b3d25344d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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10 . 如图1,在矩形ABCD中,
,
,点E从点B出发,沿BC边运动到点C,连结DE,过点E作DE的垂线交AB于点F.
求证:
;
求BF的最大值;
如图2,在点E的运动过程中,以EF为边,在EF上方作等边
,求边EG的中点H所经过的路径长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaf0a82ce7d7c3a93ce191d95ea23411.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1745e89e942a6b9fde356ea7202a50e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f441e34a2e5788ef6e7bfd8eb058a00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4bb89a362c1faf4d0c306eabbb59710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/104e1834e64c70f2b2a6d48452f71b24.png)
![](https://img.xkw.com/dksih/QBM/2018/6/5/1960554969743360/1961704607350784/STEM/3740c5ac83454f0db139269f966942ec.png?resizew=320)
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2018-06-07更新
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2卷引用:【全国市级联考】福建省泉州市2018届九年级中考数学二模试题