在△ABC中AB=15,AC=13,高AD=12,求BC的长.
更新时间:2019-03-07 19:08:59
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【知识点】 勾股定理
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较易
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【推荐1】如图,由太原到北京的“和谐号”动车在距离铁轨
米的点C处(即
米,
),当动车车头在点A处时,恰好位于点C处的北偏东
的方向上,
秒后,动车车头由A处到达点B处,此时测得B,C两点间的距离为
米,求这列动车的平均速度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b685c556cc423e4833c1dc671a134cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/113bb722c5f69f4e53cb01c2dcba810f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/12/130c367d-766e-4f70-b48f-8a31acc36ce1.png?resizew=356)
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解答题-问答题
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较易
(0.85)
【推荐2】如图,
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于点E,交
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