如图,“人字梯”放在水平的地面上,当梯子的一边与地面所夹的锐角
为
时,两梯角之间的距离BC的长为
周日亮亮帮助妈妈整理换季衣服,先使
为
,后又调整
为
,则梯子顶端离地面的高度AD下降了______
结果保留根号
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a1486450f300f451e711d2238eaca1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fe8dc472dade6cea6943164792ab532.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f55afdcf7046735ca6a388aaf16cf7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a1486450f300f451e711d2238eaca1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fe8dc472dade6cea6943164792ab532.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a1486450f300f451e711d2238eaca1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe8140a38ee6b0b28a5b661f8b1f3d5e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://img.xkw.com/dksih/QBM/2019/3/29/2170782121623552/2176751815892992/STEM/631f9def89a540ac8801f5ed4b5f88df.png?resizew=78)
更新时间:2019-04-06 19:55:49
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