名校
解题方法
1 . 下列说法正确的是_____________________
①若
,则
的值为1;
②已知
,则
的最小值为9;
③设
,则“
”是“
”的充分而不必要条件.
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88452aa51ff69fbcbb2632d2ed3a2cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f7266b2ef457b8ddeee3fa2cc24022e.png)
②已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ffcf239966d57ccaf5af7089bcb01e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac42025e439a68768819900999631ed3.png)
③设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb63478132d4c1fef3c17e591919da83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18f8675be2bff3a93388dad29f6a17fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0153f1f52c440bb25e9d644bf39f57e.png)
您最近一年使用:0次
2 . 求下列各式的值
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e78c4f4fc0631b8d6e7be70603273d7.png)
(2)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3b9c7cfacd028a11466f2238511b3bf.png)
(3)已知
都是锐角,
,求
的值.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e78c4f4fc0631b8d6e7be70603273d7.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3b9c7cfacd028a11466f2238511b3bf.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ae25caa5f175118a075d5434741d34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6942971ce330519c1380cef20145e6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22a4c731689c7c2b9e129b4be8be0d54.png)
您最近一年使用:0次