(x-2y)(x+2y)^2等于多少(要过程)

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(x-2y)(x+2y)^2等于多少(要过程)(x-2y)(x+2y)^2等于多少(要过程)(x-2y)(x+2y)^2等于多少(要过程)(x-2y)(x+2y)^2=[(x-2y)(x+2y)](x

(x-2y)(x+2y)^2等于多少(要过程)
(x-2y)(x+2y)^2等于多少(要过程)

(x-2y)(x+2y)^2等于多少(要过程)
(x-2y)(x+2y)^2
=[(x-2y)(x+2y)](x+2y)
=(x^2-4y^2)(x+2y)
=x^3+2x^2y-4xy^2-8y^3

(x-2y)(x+2y)^2
=(x-2y)(x+2y)(x+2y)
=(x^2-4y^2)(x+2y)
=x^3+2x^2y-4xy^2-8y^3