(x²-y²)(x²+y²)(xy) 等于多少

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(x²-y²)(x²+y²)(xy) 等于多少

(x²-y²)(x²+y²)(xy) 等于多少
(x²-y²)(x²+y²)(xy) 等于多少

(x²-y²)(x²+y²)(xy) 等于多少
(x²-y²)(x²+y²)(xy)
=x5y4+x4y5