(1) (2m-3n)平方+ 多少=(2m+3n)平方计算(2)(3x-2y+1)(3x+2y-1)(3)(x-y)平方+(x-y)(x+y)(x+y)平方

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(1) (2m-3n)平方+ 多少=(2m+3n)平方计算(2)(3x-2y+1)(3x+2y-1)(3)(x-y)平方+(x-y)(x+y)(x+y)平方
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(1) (2m-3n)平方+ 多少=(2m+3n)平方计算(2)(3x-2y+1)(3x+2y-1)(3)(x-y)平方+(x-y)(x+y)(x+y)平方
(1) (2m-3n)平方+ 多少=(2m+3n)平方
计算
(2)(3x-2y+1)(3x+2y-1)
(3)(x-y)平方+(x-y)(x+y)(x+y)平方

(1) (2m-3n)平方+ 多少=(2m+3n)平方计算(2)(3x-2y+1)(3x+2y-1)(3)(x-y)平方+(x-y)(x+y)(x+y)平方
(2m-3n)²+24mn=(2m-3n)²
(3x-2y+1)(3x+2y-1)
=[3x-(2y-1)][3x+(2y-1)]
=(3x)²-(2y-1)²
=9x²-4y²+4y-1
(x-y)²+(x-y)(x+y)(x+y)²

1、加24mn,