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(3x+1)^2(3x-1)^2 (x-2y)(x+2y)-(x+2y)^2 -36a^2+12ab-b^2 (2m-3n)^2-2m+3n (x+2y)(x-2y)-(2x-y)(-2x-y)

分类: 作业答案 • 2021-12-30 12:35:46
问题描述：

(3x+1)^2(3x-1)^2 (x-2y)(x+2y)-(x+2y)^2 -36a^2+12ab-b^2 (2m-3n)^2-2m+3n (x+2y)(x-2y)-(2x-y)(-2x-y)
(2a+b)^2-(3a-b)^2+5a(a-b)
(3x+1)^2(3x-1)^2 (x-2y)(x+2y)-(x+2y)^2 -36a^2+12ab-b^2 (2m-3n)^2-2m+3n (x+2y)(x-2y)-(2x-y)(-2x-y) (2a+b)^2-(3a-b)^2+5a(a-b)要过程

答

(3x+1)^2(3x-1)^2 =[(3x+1)(3x-1)]^2=(9x^2-1)^2=81x^4-18x^2+1(x-2y)(x+2y)-(x+2y)^2 =(x+2y)(x-2y-x-2y)=-4y(x+2y)=-4xy-8y^2-36a^2+12ab-b^2=-(36a^2-12ab+b^2)=-(6a-b)^2(2m-3n)^2-2m+3n =(2m-3n)(2m-3n-1)(x+2y...

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