(1)计算:(﹣2)2sin60°﹣(﹣
)•
﹣(﹣
)0;
(2)已知x,y满足方程组
,求2x﹣2y的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cde029ac94c601540583c64bc48c17bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(2)已知x,y满足方程组
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71222c11694e8f1aa1f6ae84dcffb552.png)
更新时间:2016-12-06 13:41:45
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【知识点】 特殊角三角函数值的混合运算解读