如图,在
中,
,
,
是
的中线,求证:
是等边三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccf7bbcc6deed520368b89c90502dab7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/21/ed4bf0ab-446e-4240-a92a-7c90ab21cebb.png?resizew=217)
更新时间:2023-05-17 09:56:52
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解答题-证明题
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【推荐1】(1)如图1,∠B=∠C,BD=CE,AB=DC.
①求证:
为等腰三角形.
②若∠B=60°,求∠DAE的度数.
![](https://img.xkw.com/dksih/QBM/2020/11/16/2594320536100864/2596844516892672/STEM/efb82609e6ff498ebad72aedbb067acd.png?resizew=173)
学之道在于悟.希望同学们在问题(1)解决过程中有所悟,再继续探索研究问题(2).
(2)如图2,射线AM与BN,MA⊥AB,NB⊥AB,点P是AB上一点,在射线AM与BN上分别作点C、点 D ,使
为等腰直角三角形(画出一个即可,无需证明).
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
②若∠B=60°,求∠DAE的度数.
![](https://img.xkw.com/dksih/QBM/2020/11/16/2594320536100864/2596844516892672/STEM/efb82609e6ff498ebad72aedbb067acd.png?resizew=173)
学之道在于悟.希望同学们在问题(1)解决过程中有所悟,再继续探索研究问题(2).
(2)如图2,射线AM与BN,MA⊥AB,NB⊥AB,点P是AB上一点,在射线AM与BN上分别作点C、点 D ,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dc6b0f69ed7e3633248f6b1c093e874.png)
![](https://img.xkw.com/dksih/QBM/2020/11/16/2594320536100864/2596844516892672/STEM/bfdb4f972c124804b77369384a7dedc5.png?resizew=117)
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解答题-作图题
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【推荐2】如图,在
中,
,
.
的垂直平分线
,交
于点D,连接
.
(2)在(1)所作的图形中,证明:
是等边三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83a4d634d3d678a1912a827fade6a0d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)在(1)所作的图形中,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
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解答题-证明题
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名校
【推荐1】如图,在正方形ABCD中,E是BC的中点,连接AE,过点B作射线BM交CD于点F,
交AE于点O,且BF⊥AE .
![](https://img.xkw.com/dksih/QBM/2022/2/7/2911366910615552/2930430364237824/STEM/50b5ccef91f1441589b46174409f3e69.png?resizew=157)
(1)求证:BF=AE;
(2)连接OD,猜想OD与AB的数量关系,并证明.
交AE于点O,且BF⊥AE .
![](https://img.xkw.com/dksih/QBM/2022/2/7/2911366910615552/2930430364237824/STEM/50b5ccef91f1441589b46174409f3e69.png?resizew=157)
(1)求证:BF=AE;
(2)连接OD,猜想OD与AB的数量关系,并证明.
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解答题-证明题
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【推荐2】在△ABC中,∠ACB=90°,AC=BC=10,点D为AB的中点,连结DC.点E以每秒1个单位长度的速度从点A出发,沿射线AC方向运动,连结DE.过点D作DF⊥DE,交射线CB于点F,连结EF.设点E的运动时间为t(秒).
![](https://img.xkw.com/dksih/QBM/2021/12/28/2889099165720576/2915623365869568/STEM/7dbb2e83-4fab-4d94-800f-bc021ee4db60.png?resizew=156)
(1)如图,当0<t<10时.
①求证:∠ADE=∠CDF;
②试探索四边形CEDF的面积是否为定值?若为定值,求出这个定值;若不为定值,请说明理由;
(2)当t≥10时,试用含t的代数式表示△DEF的面积.
![](https://img.xkw.com/dksih/QBM/2021/12/28/2889099165720576/2915623365869568/STEM/7dbb2e83-4fab-4d94-800f-bc021ee4db60.png?resizew=156)
(1)如图,当0<t<10时.
①求证:∠ADE=∠CDF;
②试探索四边形CEDF的面积是否为定值?若为定值,求出这个定值;若不为定值,请说明理由;
(2)当t≥10时,试用含t的代数式表示△DEF的面积.
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