如图,△ACB和△ECD都是等腰直角三角形,∠ACB=∠ECD=90°,D为AB边上一点.
(1)求证:△ACE≌△BCD;
(2)若CB=
,AD=2,求DE的长.
(1)求证:△ACE≌△BCD;
(2)若CB=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8af2fdf1944afebb51cb6a5e6c74aadd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/6/a2a776b8-f8f8-4575-ba68-b37d42874839.png?resizew=174)
18-19八年级上·广东深圳·期中 查看更多[7]
更新时间:2019-01-14 22:55:31
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解答题-问答题
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适中
(0.65)
【推荐1】如图1,是某保温杯的实物图和平面抽象示意图.点
,
是保温杯上两个固定点,与两活动环相连,把手
与两个活动环
,
相连,现测得
,
,如图2,当
,
,
三点共线时,恰好
.
(1)请求把手
的长;
(2)如图3,当
时,求
的度数.
(参考数据:
,
,
)
![](https://img.xkw.com/dksih/QBM/2020/5/9/2458975444303872/2458997191655424/STEM/da7f6ab780fc4ae08b438993cbedbe40.png?resizew=110)
![](https://img.xkw.com/dksih/QBM/2020/5/9/2458975444303872/2458997191655424/STEM/a5cccc46e5064acea4800653187b8015.png?resizew=112)
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1edc4f128cee12a187393beac01c039a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76405876738df64224062192432b0b73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
(1)请求把手
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3402ea855e2ae2dcd98f607bef4fdd6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
(参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2127d208712fb70fe0b4118a16c8d613.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93dd07817a184bec2ddb8d5be4a50aae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85af226b73099c2bf8ec3be4e2564004.png)
![](https://img.xkw.com/dksih/QBM/2020/5/9/2458975444303872/2458997191655424/STEM/9ff9ea24c2ba4b26a3b4fcf9bc808103.png?resizew=90)
![](https://img.xkw.com/dksih/QBM/2020/5/9/2458975444303872/2458997191655424/STEM/da7f6ab780fc4ae08b438993cbedbe40.png?resizew=110)
![](https://img.xkw.com/dksih/QBM/2020/5/9/2458975444303872/2458997191655424/STEM/a5cccc46e5064acea4800653187b8015.png?resizew=112)
![](https://img.xkw.com/dksih/QBM/2020/5/9/2458975444303872/2458997191655424/STEM/552d1a441b234428862e435898deb49e.png?resizew=110)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,
是
的外接圆,
为直径,
,
交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/12/b426c20e-1fd3-479a-bed0-e471c58a0002.png?resizew=186)
(1)求证:
是
的切线;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/12/b426c20e-1fd3-479a-bed0-e471c58a0002.png?resizew=186)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/065f2c3527fcc9d84939c47ac8640643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8cc58ef27567f0ab06eb1012aec330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
您最近一年使用:0次