计算(3xy-2x²+1/2y²)(3xy+2x²-1/2y²)
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计算(3xy-2x²+1/2y²)(3xy+2x²-1/2y²)计算(3xy-2x²+1/2y²)(3xy+2x²-1/2y
计算(3xy-2x²+1/2y²)(3xy+2x²-1/2y²)
计算(3xy-2x²+1/2y²)(3xy+2x²-1/2y²)
计算(3xy-2x²+1/2y²)(3xy+2x²-1/2y²)
(3xy-2x²+1/2y²)(3xy+2x²-1/2y²)
=[3xy-(2x²-1/2y²)][3xy+(2x²-1/2y²)]
=(3xy)²-(2x²-1/2y²)²
=9x²y²-(4x^4-2x²y²+1/4y^4)
=11x²y²-4x^4-1/4y^4)