-2x2(12xy+y2)(x-1)(2x+3)(2x-y)(2x+y)-(x-3y)2(2a+b+1)(2a+b-1)-数学

题目简介

-2x2(12xy+y2)(x-1)(2x+3)(2x-y)(2x+y)-(x-3y)2(2a+b+1)(2a+b-1)-数学

题目详情

-2x2(
1
2
xy+y2)

(x-1)(2x+3)
(2x-y)(2x+y)-(x-3y)2
(2a+b+1)(2a+b-1)
题型:解答题难度:中档来源:不详

答案

-2x2(class="stub"1
2
xy+y2)=-x3y-2x2y2;

(x-1)(2x+3)
=2x2+3x-2x-3
=2x2+x-3;

(2x-y)(2x+y)-(x-3y)2
=4x2-y2-(x2-6xy+9y2)
=4x2-y2-x2+6xy-9y2
=3x2+6xy-10y2;

(2a+b+1)(2a+b-1)
=(2a+b)2-1
=4a2+4ab+b2-1.

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