如右图,在
中,设
,
,点
在
边上.
![](https://img.xkw.com/dksih/QBM/2016/6/23/1572816948092928/1572816954335232/STEM/c5115a9784104d09bc8ed4761c303ac5.png)
(I)若
为
边中点,求证:
;
(II)若
,求证:
.
![](https://img.xkw.com/dksih/QBM/2016/6/23/1572816948092928/1572816954335232/STEM/5e506f560baf4848842438ec7b37fd23.png)
![](https://img.xkw.com/dksih/QBM/2016/6/23/1572816948092928/1572816954335232/STEM/7906e61f0ef640d4ab88fc6560fd635a.png)
![](https://img.xkw.com/dksih/QBM/2016/6/23/1572816948092928/1572816954335232/STEM/043859e7cffc4f08b32bbdaaf9c52d01.png)
![](https://img.xkw.com/dksih/QBM/2016/6/23/1572816948092928/1572816954335232/STEM/ce184601fa744b629ec83bd55b70603f.png)
![](https://img.xkw.com/dksih/QBM/2016/6/23/1572816948092928/1572816954335232/STEM/28919d6cdcd94714949bf0cf43c9868d.png)
![](https://img.xkw.com/dksih/QBM/2016/6/23/1572816948092928/1572816954335232/STEM/c5115a9784104d09bc8ed4761c303ac5.png)
(I)若
![](https://img.xkw.com/dksih/QBM/2016/6/23/1572816948092928/1572816954335232/STEM/ce184601fa744b629ec83bd55b70603f.png)
![](https://img.xkw.com/dksih/QBM/2016/6/23/1572816948092928/1572816954335232/STEM/28919d6cdcd94714949bf0cf43c9868d.png)
![](https://img.xkw.com/dksih/QBM/2016/6/23/1572816948092928/1572816954335232/STEM/2f7418c3bd8544f7811868759d26e956.png)
(II)若
![](https://img.xkw.com/dksih/QBM/2016/6/23/1572816948092928/1572816954335232/STEM/d1103989172743399d5e5cc9edae737e.png)
![](https://img.xkw.com/dksih/QBM/2016/6/23/1572816948092928/1572816954335232/STEM/9056b73698a44cc8a4f0ee69edadbe5b.png)
更新时间:2016-12-04 13:27:11
|
相似题推荐
解答题-问答题
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适中
(0.65)
名校
解题方法
【推荐1】在
中,内角A,B,C所对的边分别为a,b,c,已知
.
(1)求角B的大小;
(2)设
,
的面积为S,周长为L,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/901805ccfb9d2af1cc95cbccec65877b.png)
(1)求角B的大小;
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6271fd64db6ec6bf6407bd9ed7547044.png)
您最近一年使用:0次
【推荐2】在①
,②
,③
三个条件中任选一个补充在下面的横线上,并加以解答.
在
中,角A,B,C的对边分别为a,b,c且__________,作AB⊥AD,使得四边形ABCD满足
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/18/dc8d07d5-f454-4f40-b8ec-4290a0497217.png?resizew=179)
(1)求角B的值;
(2)求BC的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/204518fa66e426d2dff79415a5a61433.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/213f068f2be41e3013e82664d5c47f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79510f60d183b9d16390b703964d4312.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a06aa91c5d3dc4e9791d4723aa2a345.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d783fe7f3ce673d5d21281174e7a7968.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/18/dc8d07d5-f454-4f40-b8ec-4290a0497217.png?resizew=179)
(1)求角B的值;
(2)求BC的取值范围.
您最近一年使用:0次