(x-3y)(x^2+9y^2)(x+3y)
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(x-3y)(x^2+9y^2)(x+3y)(x-3y)(x^2+9y^2)(x+3y)(x-3y)(x^2+9y^2)(x+3y)原式=(x+3y)(x-3y)(x^2+9y^2)=(x^2-9y^
(x-3y)(x^2+9y^2)(x+3y)
(x-3y)(x^2+9y^2)(x+3y)
(x-3y)(x^2+9y^2)(x+3y)
原式=(x+3y)(x-3y)(x^2+9y^2)
=(x^2-9y^2)(x^2+9y^2)
=x^4-81y^4
原式=(x-3y)(x+3y)(x^2+9y^2)
=(x^2-9y^2)(x^2+9y^2)
=x^4-81y^4
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