已知a为实数,化简:
,阅读下面李华的解答过程,请判断是否正确?若不正确,请写出正确的解答过程:
李华的解答过程:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2856ccc2a1b74706f5179a354867fe8e.png)
李华的解答过程:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d74597a4f2774904e3e0507712e856a.png)
更新时间:2019-02-19 15:12:45
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适中
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【推荐2】在
中,E,F为
上的两点,且
,
.
;
(2)求证:
是矩形;
(3)连接
,若
是
的平分线,
,
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0a3600b1760a63a10c9a0429b439dc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/298fe516591c06e3183176021a8cf573.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60634341a9603e24b2bbc6960abe3d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/788d54173822176240e37b26ba69875a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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