【简答题】![](https://cos-cdn.shuashuati.com/shuashuati-web/2024-0521-0905-00/logo-new-ad743.png)
为做好防汛工作,防汛指挥部决定对某水库的水坝进行加高加固,专家提供的方案是:水坝加高2米(即CD=2米),背水坡DE的坡度i=1:1(即DB:EB=1:1),如图28-2-2-9所示.已知AE=4米,∠EAC=130o,求水坝原来的高度BC.(参考数据:sin 50o≈0.77 ,cos 50o≈0.,tan 50o≈1.2)(简答题过程请写出来,并拍照上传)
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参考答案:
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参考解析:
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