(3x-2y-5)(3x+2y-5)-2x(6x+y)-(3x-y)(-y-x)-数学

题目简介

(3x-2y-5)(3x+2y-5)-2x(6x+y)-(3x-y)(-y-x)-数学

题目详情

(3x-2y-5)(3x+2y-5)-2x(6x+y)-(3x-y)(-y-x)
题型:解答题难度:中档来源:不详

答案

(3x-2y-5)(3x+2y-5)-2x(6x+y)-(3x-y)(-y-x),
=(3x-5)2-4y2-12x2-2xy+3xy-y2+3x2-xy,
=9x2-30x+25-4y2-12x2-2xy+3xy-y2+3x2-xy,
=-30x+25-5y2.

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