在
中,角
所对的边分别为
,已知
,
(Ⅰ)求
的大小;
(Ⅱ)若
,求
的取值范围.
![](https://img.xkw.com/dksih/QBM/2014/1/16/1571484737544192/1571484743286784/STEM/c3765f6d1cd947faaf9fb7f70f6a3367.png)
![](https://img.xkw.com/dksih/QBM/2014/1/16/1571484737544192/1571484743286784/STEM/07248904baac49508051a963bbcf8e86.png)
![](https://img.xkw.com/dksih/QBM/2014/1/16/1571484737544192/1571484743286784/STEM/e1b8bcb4a2144820b33ef0fabe9c605d.png)
![](https://img.xkw.com/dksih/QBM/2014/1/16/1571484737544192/1571484743286784/STEM/20adc935df3b4f57a3b58f3c5b9c8b28.png)
(Ⅰ)求
![](https://img.xkw.com/dksih/QBM/2014/1/16/1571484737544192/1571484743286784/STEM/7546600f0b484b748fc2ddc075173a3e.png)
(Ⅱ)若
![](https://img.xkw.com/dksih/QBM/2014/1/16/1571484737544192/1571484743286784/STEM/e3124c6702de44b281551e0611e7508f.png)
![](https://img.xkw.com/dksih/QBM/2014/1/16/1571484737544192/1571484743286784/STEM/1e999f858c314fb0be908bf342c7b889.png)
2013·云南昆明·一模 查看更多[2]
更新时间:2016-12-02 11:09:28
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【推荐2】如图,已知在Rt△ABC中,
,
,
,它的内接正方形DEFG的一边EF在斜边BA上,D、G分别在边BC、CA上,设△ABC的面积为
,正方形DEFG的面积为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/02fe304c-ce71-4ff4-b167-63e68cde1a80.png?resizew=190)
(1)试用
、
分别表示
和
;
(2)设
,求
的最大值,并求出此时的
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f149e83812e72efd7dd3dfc78d0134ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c8d03a113f0b00eddccbb580c8a0881.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e781a2489271bfd1597cba1bb6f5887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/02fe304c-ce71-4ff4-b167-63e68cde1a80.png?resizew=190)
(1)试用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07565132fff1e458c4d701a575d90a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd288d4152caf5fc8187a1a901c8949f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
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