如图,
是
的直径,C是
上的一个动点,延长
至
,使
,
垂直于弦
,垂足为点
,点
在
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/14/467b9ff8-c85e-4f94-a6bc-e0214962b055.png?resizew=239)
(1)当
与
相切时,求
的度数;
(2)芳芳观察后发现,
的值为
,点点说
的值随动点
的变化而变化,你为谁的结论是正确的,请给予证明;
(3)设
,求
与
之间的函数关系式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fc1fc39fa72c334a321129d893899a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/14/467b9ff8-c85e-4f94-a6bc-e0214962b055.png?resizew=239)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3df0ba997bb8f5b2f2a2b677391ebc22.png)
(2)芳芳观察后发现,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ca91716d4c4b47185a7ddf88b435b3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ca91716d4c4b47185a7ddf88b435b3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccfe7bd500e01042eed9b25676264471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
22-23九年级下·浙江杭州·阶段练习 查看更多[3]
更新时间:2023-04-11 11:12:17
|
相似题推荐
解答题-证明题
|
较难
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【推荐1】如图,AB是⊙O的直径,PA是⊙O的切线,点C在⊙O上,PA=PC.
![](https://img.xkw.com/dksih/QBM/2022/4/24/2964847219277824/2967367335256064/STEM/1594586ad6504fa0be5486cceec913e5.png?resizew=187)
(1)求证:CB∥PO.
(2)若AB=10,CB=6,求PC的长.
![](https://img.xkw.com/dksih/QBM/2022/4/24/2964847219277824/2967367335256064/STEM/1594586ad6504fa0be5486cceec913e5.png?resizew=187)
(1)求证:CB∥PO.
(2)若AB=10,CB=6,求PC的长.
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名校
【推荐2】如图,平面直角坐标系中,
,点E为线段
的中点,过点E作直线
平行于x轴交线段
于点D,动点Q从点B出发沿射线
以每秒1个单位的速度运动,过点Q作
直线
垂足为P,过E、P、Q三点作圆,交线段
于点N,连接
,设点Q运动的时间为t秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/baacd156-6b9e-4320-b6b7-76b30eec1028.png?resizew=178)
(1)求经过A、B、C三点的抛物线表达式;
(2)当
与
相似时,求t的值;
(3)当
的外接圆与线段
有公共点时,求t的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17dd3189d05ed0456a08822e6cfbe995.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.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/a0bc73504c9eaed54d3014ca5ce831ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0d8cc4601a5c3c6ca9da0b19f02255f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/baacd156-6b9e-4320-b6b7-76b30eec1028.png?resizew=178)
(1)求经过A、B、C三点的抛物线表达式;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d36626c9e45a25e8dc5bf4be4dbbfb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17277a306d4d0a0a0cf293f87802cf66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
您最近一年使用:0次
解答题-计算题
|
较难
(0.4)
【推荐1】问题背景
折纸是一种将纸张折成各种不同形状的艺术活动,折纸大约起源于公元1世纪或者2世纪时的中国,6世纪时传入日本,再经由日本传到全世界,折纸与自然科学结合在一起,不仅成为建筑学院的教具,还发展出了折纸几何学,成为现代几何学的一个分支.今天折纸被应用于世界各地,其中比较著名的是日本筑波大学的芳贺和夫发现的折纸几何三定理,它已成为折纸几何学的基本定理.
芳贺折纸第一定理的操作过程及内容如下:
第一步:如图1,将正方形纸片ABCD对折,使点A与点D重合,点B与点C重合.再将正方形ABCD展开,得到折痕EF;
第二步:将正方形纸片的右下角向上翻折,使点C与点E重合,边BC翻折至
的位置,得到折痕MN,
与AB交于点P.
则点P为AB的三等分点,即
.
问题解决
如图1,若正方形ABCD的边长是2.
![](https://img.xkw.com/dksih/QBM/2022/4/14/2957562914922496/2962009485664256/STEM/2a78022e-6819-4e9c-b7df-431965f59c97.png?resizew=168)
(1)CM的长为______;
(2)请通过计算AP的长度,说明点P是AB的三等分点.
类比探究
(3)将长方形纸片
按问题背景中的操作过程进行折叠,如图2,若折出的点P也为AB的三等分点,请直接写出
的值.
折纸是一种将纸张折成各种不同形状的艺术活动,折纸大约起源于公元1世纪或者2世纪时的中国,6世纪时传入日本,再经由日本传到全世界,折纸与自然科学结合在一起,不仅成为建筑学院的教具,还发展出了折纸几何学,成为现代几何学的一个分支.今天折纸被应用于世界各地,其中比较著名的是日本筑波大学的芳贺和夫发现的折纸几何三定理,它已成为折纸几何学的基本定理.
芳贺折纸第一定理的操作过程及内容如下:
第一步:如图1,将正方形纸片ABCD对折,使点A与点D重合,点B与点C重合.再将正方形ABCD展开,得到折痕EF;
第二步:将正方形纸片的右下角向上翻折,使点C与点E重合,边BC翻折至
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9601d29de0a884953b039ee72f0158fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9601d29de0a884953b039ee72f0158fe.png)
则点P为AB的三等分点,即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0762046501add3c10dc910a18bef799d.png)
问题解决
如图1,若正方形ABCD的边长是2.
![](https://img.xkw.com/dksih/QBM/2022/4/14/2957562914922496/2962009485664256/STEM/2a78022e-6819-4e9c-b7df-431965f59c97.png?resizew=168)
(1)CM的长为______;
(2)请通过计算AP的长度,说明点P是AB的三等分点.
类比探究
(3)将长方形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a112ee482c0359e0c38d9277e6ff8b1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea79586df2029edb34c7cb2f67dc3722.png)
![](https://img.xkw.com/dksih/QBM/2022/4/14/2957562914922496/2962009485664256/STEM/7785edf0-9a9f-41b1-a7b8-c71fc6ab3526.png?resizew=179)
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解答题-证明题
|
较难
(0.4)
【推荐2】如图,
,
平分
,点B是射线
上一定点,点C在直线
上运动,连接
,将
(
)的两边射线
和
分别绕点B顺时针旋转
,旋转后角的两边分别与射线
交于点D和点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/967e1906-8ac4-40c8-a272-79ebfcd8e048.png?resizew=365)
(1)如图1,当点C在射线
上时,①请判断线段
与
的数量关系,写出结论并证明;②请探究线段
,
和
之间的数量关系,写出结论并证明;
(2)如图2,当点C在射线
的反向延长线上时,
交射线
于点F,若
,
,请直接写出线段
和
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3181e58f09e9fec4e43e422b82831b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358c69b4f6c350c35d19d33c69f2a2a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4c1b2c2a110c2cfd995d4e88817fce3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/967e1906-8ac4-40c8-a272-79ebfcd8e048.png?resizew=365)
(1)如图1,当点C在射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)如图2,当点C在射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29e240a6378adf6d23ebf9cc710c9bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
您最近一年使用:0次
解答题-作图题
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较难
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解题方法
【推荐3】如图,在平面直角坐标系中,矩形
的边
的边分别在
轴,
轴正半轴上,
, 点
从点
出发以每秒2个单位长度的速度向终点
运动,点
不与点
重合以
为边在
上方作正方形
,设正方形
与
的重叠部分图形的面积为
(平方单位),点
的运动时间为
(秒).
![](https://img.xkw.com/dksih/QBM/2020/4/25/2449267679617024/2449664206282752/STEM/28cec3bf0c7e43899581960510096ff8.png?resizew=277)
(1)直线
所在直线的解析式是__________________________.
(2)当点
落在线段
上时,求
的值.
(3)在点
运动的过程中,求
与
之间的函数关系式;
(4)设边
的中点为
,点
关于点
的对称点为
,以
为边在
上方作正方形
当正方形
与
重叠部分图形为三角形时,直接写出
的取值范围.
(提示:根据点
的运动,可在草纸上画出正方形
与
重叠部分图形为不同图形时的临界状态去研究.)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8044faecc4d5a611814a7f1e64dbf8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b05926b118e071725705071508911b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c253a4588951ab92f5bba862bdca60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c253a4588951ab92f5bba862bdca60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3304bc1372275307dce0bf4e98b8f3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/2020/4/25/2449267679617024/2449664206282752/STEM/28cec3bf0c7e43899581960510096ff8.png?resizew=277)
(1)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(4)设边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.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/3557809c066e68395b614535a7675e76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91474b473d5572e771b96ce9bad76e30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cb8ed76c4136d303e01ebaad7ba375f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cb8ed76c4136d303e01ebaad7ba375f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(提示:根据点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cb8ed76c4136d303e01ebaad7ba375f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
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【推荐1】如图,正方形ABCD中,G是BC中点,DE⊥AG于E,BF⊥AG于F,GN∥DE,M是BC延长线上一点.
(1)求证:△ABF≌△DAE
(2)尺规作图:作∠DCM的平分线,交GN于点H(保留作图痕迹,不写作法和证明),试证明GH=AG.
(1)求证:△ABF≌△DAE
(2)尺规作图:作∠DCM的平分线,交GN于点H(保留作图痕迹,不写作法和证明),试证明GH=AG.
![](https://img.xkw.com/dksih/QBM/2017/6/12/1707371972460544/1707991882170368/STEM/e9e2fc82b8f64c5f982ac0e038f80570.png?resizew=252)
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【推荐2】四边形
是边长为4的正方形,点E沿A→D→C路线向C点运动,连接
,在
的右侧以
为腰作等腰直角三角形
,
,
交射线
于点N.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/6ef92b4c-e409-4f67-8855-314d7a288782.png?resizew=375)
(1)如图1,点E在
上时,
交
于点M,若
,请直接 写出:
①点F到直线
的距离;
②
的长;
(2)如图2,点E在
上时,
①若
,求
的长;
②连接
,请直接 写出
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d44584fd148c9b28da7b311798bfba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/6ef92b4c-e409-4f67-8855-314d7a288782.png?resizew=375)
(1)如图1,点E在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cbe47ceb32cde3e40a3386b2c964e1c.png)
①点F到直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
(2)如图2,点E在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f05cd9484716ad6ac08b32caa90b0c75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
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真题
【推荐1】如图,已知
是等边三角形,P是
内部的一点,连接BP,CP.
(1)如图1,以BC为直径的半圆O交AB于点Q,交AC于点R,当点P在
上时,连接AP,在BC边的下方作
,
,连接DP,求
的度数;
(2)如图2,E是BC边上一点,且
,当
时,连接EP并延长,交AC于点F.若
,求证:
;
(3)如图3,M是AC边上一点,当
时,连接MP.若
,
,
,
的面积为
,
的面积为
,求
的值(用含a的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)如图1,以BC为直径的半圆O交AB于点Q,交AC于点R,当点P在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4053dea603c2edab93d423355cf100b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f91ab06df7e88bf7ce432cbfa6f691b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdf97fc873a3ee1723f5dfbd8c26fc91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd601617f0ab200d5c80c37ab41d7323.png)
(2)如图2,E是BC边上一点,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dad2400ca89c8757264ad37a96fdf45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d99c32010454333ca6066b003854e42e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f51cfd0674f2f09581b758258590ffb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53fdac1a233bb3702b01c4b252f75d.png)
(3)如图3,M是AC边上一点,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a57bddefd839521ba5a4bb7eb40cf2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/136f6ee88d829a61528602f57a17944e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b78253febc226be3328df82b585a409d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e7f7290f9017d59c4b1fc7f76763640.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357265c532428e886a643e8e653eec9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a38c43d922840f5f7693007beeb62b34.png)
![](https://img.xkw.com/dksih/QBM/2021/6/29/2753292342427648/2753465083273216/STEM/a8b28f62-a6d0-4180-a6d1-4f0b90678598.png)
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【推荐2】如图,一透明的敞口正方体容器ABCD-A′B′C′D′中装有一些液体,棱AB始终在水平桌面上,容器底部的倾斜角为α(∠CBE=α).
探究:如图①,液面刚好过棱CD,并与棱BB′交于点Q,此时液体的形状为直三棱柱,其三视图及尺寸如图②所示.
解决问题:
(1)CQ与BE的位置关系是________,BQ的长是________dm;
(2)求液体的体积(提示:V液=S△BCQ×高AB);
(3)求液面到桌面的高度和倾斜角α的度数(
).
探究:如图①,液面刚好过棱CD,并与棱BB′交于点Q,此时液体的形状为直三棱柱,其三视图及尺寸如图②所示.
解决问题:
(1)CQ与BE的位置关系是________,BQ的长是________dm;
(2)求液体的体积(提示:V液=S△BCQ×高AB);
(3)求液面到桌面的高度和倾斜角α的度数(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b67c69ad1282080bd52dbf3cacccf625.png)
![](https://img.xkw.com/dksih/QBM/2017/10/11/1799325551386624/1809439367446528/STEM/5c1ac7e37021416fabb005516a995784.png?resizew=224)
您最近一年使用:0次