化简:
(1)﹣3xy﹣2y2+5xy﹣4y2 ;
(2)2(5a2﹣2a)﹣4(﹣3a+2a2);
(3)3m2﹣
(2m2﹣mn+2n2)+(n2+mn﹣m2).
(1)﹣3xy﹣2y2+5xy﹣4y2 ;
(2)2(5a2﹣2a)﹣4(﹣3a+2a2);
(3)3m2﹣
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
更新时间:2019-11-08 22:31:30
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