(x^2y^2)^2(x+3)^2(x-y)^2 今天就要,

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(x^2y^2)^2(x+3)^2(x-y)^2 今天就要,
(x^2y^2)^2(x+3)^2(x-y)^2 今天就要,

(x^2y^2)^2(x+3)^2(x-y)^2 今天就要,
原式=(x^4y^4)(x²+6x+9)(x²-2xy+y²)
=(x^4y^4×x²+x^4y^4×6x+x^4y^4×9)(x²-2xy+y²)
=(x^6y^4+6x^5y^4+9x^4y^4)(x²-2xy+y²)
=x^6y^4×x²+x^6y^4×(-2xy)+x^6y^4×y²+6x^5y^4×x²+6x^5y^4×(-2xy)+6x^5y^4×y²+9x^4y^4×x²+9x^4y^4×(-2xy)+9x^4y^4×y²
=x^8y^4-2x^7y^5+x^6y^6+6x^7y^4-12x^6y^5+6x^5y^6+9x^6y^4-18x^5y^5+9x^4y^6