计算题(1)3y2-x2+(2x-y)-(x2+3y2)(2)(x3y+xy2)-2(x3y-2xy2)-数学

题目简介

计算题(1)3y2-x2+(2x-y)-(x2+3y2)(2)(x3y+xy2)-2(x3y-2xy2)-数学

题目详情

计算题
(1)3y2-x2+(2x-y)-(x2+3y2
(2)(x3y+xy2)-2(x3y-2xy2
题型:解答题难度:中档来源:不详

答案

(1)原式=3y2-x2+2x-y-x2-3y2
=3y2-3y2-x2-x2+2x-y
=-2x2+2x-y;

(2)原式=x3y+xy2-2x3y+4xy2
=x3y-2x3y+xy2+4xy2
=5xy2-x3y.

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