1 . 已知
,且
、
、
是
的三边长,试判断
的形状,并证明之.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83dd6a814dd7e75d45f9b33d79644120.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
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13-14高三上·上海·阶段练习
2 . 行列式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a21d96db37867123d156816e6eceb937.png)
按第一列展开得
,记函数
,且
的最大值是
.
(1)求
;
(2)将函数
的图像向左平移
个单位,再将所得图像上各点的横坐标扩大为原来的
倍,纵坐标不变,得到函数
的图像,求
在
上的值域.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a21d96db37867123d156816e6eceb937.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2797ee7d0123dfa066590b3064598ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bb2d7865666ba64c566d8738c4c01b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/329dd0529694c8bfc69c4bf8308f95a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/458b6c1f8e142098dacb00c24c76aeb8.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)将函数
![](https://img.xkw.com/dksih/QBM/2014/1/21/1571492209680384/1571492215521280/STEM/0d413bccc90b4495828b4061ad97edeb.png)
![](https://img.xkw.com/dksih/QBM/2014/1/21/1571492209680384/1571492215521280/STEM/49ae8aabed2347c38506c6f06172d8f7.png)
![](https://img.xkw.com/dksih/QBM/2014/1/21/1571492209680384/1571492215521280/STEM/509235aab41b4acd8f466dad0cb6b487.png)
![](https://img.xkw.com/dksih/QBM/2014/1/21/1571492209680384/1571492215521280/STEM/babb3ab2bfd549e0a308bc095cf9d19c.png)
![](https://img.xkw.com/dksih/QBM/2014/1/21/1571492209680384/1571492215521280/STEM/74c7d51ac1394c9895ef90a4792e1f63.png)
![](https://img.xkw.com/dksih/QBM/2014/1/21/1571492209680384/1571492215521280/STEM/ef2d81796a0a47f095014371f93c90a5.png)
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