如图,梯形
中,
,
,
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4abd947918fc8f9d06ebe8c204f25821.png)
_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6de3595bb7c79503fabd75d99196ccb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9382d9b694a0e56b8f685a50aa3e66b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4abd947918fc8f9d06ebe8c204f25821.png)
![](https://img.xkw.com/dksih/QBM/2016/12/12/1579120042860544/1579120043188224/STEM/4c3cb18f-7a58-48cd-be1b-9039f6531fa1.png)
更新时间:2016-12-13 11:10:51
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