如图所示,在
中,已知
,
,
,
为
边上的高.
![](https://img.xkw.com/dksih/QBM/2021/5/7/2715823535865856/2762872846598144/STEM/cfe35889b7dd4b58871463bb6f4d957f.png?resizew=106)
(1)求
;
(2)设
,其中
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2964fea2c107bbfd4a07fc97f4de5988.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4b6c682d7b0741fb1f12a073394fc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26fdd8e57562ba94e10e7f1d770826d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2021/5/7/2715823535865856/2762872846598144/STEM/cfe35889b7dd4b58871463bb6f4d957f.png?resizew=106)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb4a0893af81aeb9fd6ed702eb86e613.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5e80aec177e1dc7cc86f88de7b0c316.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad5a523e020e21797c0f83c2b6772588.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72850427e83ff19a24305783e080b280.png)
更新时间:2021-07-12 22:22:06
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【推荐1】已知
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【推荐2】在
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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(2)若
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【推荐1】如图所示,若D是△ABC内的一点,且AB2-AC2=DB2-DC2,求证:AD⊥BC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/34f18757-9af6-4a53-851e-b8fd78aa367f.png?resizew=143)
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【推荐1】已知向量
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/28/f67215b8-fb66-4d68-8114-bfbf945a1988.png?resizew=166)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
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