化简(x+2y)(x-2y)(x²—4y²)

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化简(x+2y)(x-2y)(x²—4y²)

(x+2y)(x-2y)(x²—4y²)
= (x+2y)(x-2y)(x+2y)(x-2y)
=(x+2y)²(x-2y)²

=(x²-4y²)(x²-4y²)
=(x²-4y²)²