(x+2y)(x-2y)(x^4-8x^2y^2+16y^4）
=(x+2y)(x-2y)(x^4-4y^2)
=(x+2y)(x-2y)(x^2+2y)(x^2-2y)
因式分解
(x+2y)(x-2y)(x^4-8x^2y^2+16y^4）
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