(x+3y)(x²+9y²)(x-3y)
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(x+3y)(x²+9y²)(x-3y)
(x+3y)(x²+9y²)(x-3y)
(x+3y)(x²+9y²)(x-3y)
原式=(x+3y)(x-3y)(x+9y²)
=(x²-9y²)(x²+9y²)
=x⁴-81y⁴
(x+3y)(x²+9y²)(x-3y)
(x+3y)(x²+9y²)(x-3y)
(x+3y)(x²+9y²)(x-3y)
原式=(x+3y)(x-3y)(x+9y²)
=(x²-9y²)(x²+9y²)
=x⁴-81y⁴