题目内容
【题目】整式运算:
(1)3ab+2mn﹣2(ab - mn); (2)2(3x+2y)+[x+2y-(x-y)].
【答案】(1)ab+4mn(2)6x+7y
【解析】
(1)去括号,再合并同类项即可求解;
(2)分别去括号,再合并同类项即可求解.
(1)3ab+2mn﹣2(ab - mn);
=3ab+2mn﹣2ab +2mn
= ab+4mn
(2)2(3x+2y)+[x+2y-(x-y)]
=6x+4y +x+2y-x+y
=6x+7y
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