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+2x²-1/2y²)](/uploads/image/z/7333468-52-8.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%883xy-2x%26%23178%3B%2B1%2F2y%26%23178%3B%EF%BC%89%EF%BC%883xy%2B2x%26%23178%3B-1%2F2y%26%23178%3B%EF%BC%89)
(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)
=[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)
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