问题
解答题
化简: (1)3(2x2-y2)-2(3y2-2x2) (2)(6m2n-5mn2)-6(
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答案
(1)原式=6x2-3y2-6y2+4x2
=10x2-9y2;
(2)原式=6m2n-5mn2-2m2n+3mn2
=4m2n-2mn2.
化简: (1)3(2x2-y2)-2(3y2-2x2) (2)(6m2n-5mn2)-6(
|
(1)原式=6x2-3y2-6y2+4x2
=10x2-9y2;
(2)原式=6m2n-5mn2-2m2n+3mn2
=4m2n-2mn2.