化简.(1)(3x-y)-(2x+3y)(2)(3x2-xy-2y2)-2(x2+xy-2y2)(3)3x2+[x2+(3x2-2x)-2(x2-3x)].-数学

题目简介

化简.(1)(3x-y)-(2x+3y)(2)(3x2-xy-2y2)-2(x2+xy-2y2)(3)3x2+[x2+(3x2-2x)-2(x2-3x)].-数学

题目详情

化简.
(1)(3x-y)-(2x+3y)
(2)(3x2-xy-2y2)-2(x2+xy-2y2
(3)3x2+[x2+(3x2-2x)-2(x2-3x)].
题型:解答题难度:中档来源:不详

答案

(1)原式=3x-y-2x-3y=x-4y;

(2)原式=3x2-xy-2y2-2x2-2xy+4y2=x2-3xy+2y2;

(3)原式=3x2+(x2+3x2-2x-2x2+6x)=3x2+2x2+4x=5x2+4x.

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