如图12,在
中,
.
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762719588352/1773762719948800/STEM/3d6165ce44584077b330dd7560baf8a5.png)
(1)利用尺规作线段
的垂直平分线
,垂足为
,交
于点
;(保留作图痕迹,不写作法)
(2)若
的周长为
,先化简
,再求
的值.
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762719588352/1773762719948800/STEM/d2503457e3784773b1e25074dddf07c2.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762719588352/1773762719948800/STEM/b59bb3e58dcb4acbb9cd9e642f60659f.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762719588352/1773762719948800/STEM/3d6165ce44584077b330dd7560baf8a5.png)
(1)利用尺规作线段
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762719588352/1773762719948800/STEM/2b3a33ce899444f5addb1cb09355033d.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762719588352/1773762719948800/STEM/229a7754ccc34798a38b1f07f2015950.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762719588352/1773762719948800/STEM/887b24cf70464b15914f6a2e557c0515.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762719588352/1773762719948800/STEM/da22de1582934ef29928e3b64be6c809.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762719588352/1773762719948800/STEM/1e3355f97edb490494294a40e65bac41.png)
(2)若
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762719588352/1773762719948800/STEM/82d0bcd9627c42ca9c131620ca5bcf49.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762719588352/1773762719948800/STEM/7b8a5b38d0024b8bbe3e60051013a69b.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762719588352/1773762719948800/STEM/f109ea068be9446b9a8acbe8afb7402a.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762719588352/1773762719948800/STEM/65bcdeb824e74c52b9057e6e24a72d2d.png)
更新时间:2017-09-14 11:12:24
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解答题-作图题
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【推荐1】如图,在
中,
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【推荐2】如图,
,
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(1)求
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(2)已知
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【推荐1】矩形
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