(3xy-2x²+2分之一y²)(3xy+2x²-2分之一y²)计算
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![(3xy-2x²+2分之一y²)(3xy+2x²-2分之一y²)计算](/uploads/image/z/440877-21-7.jpg?t=%EF%BC%883xy-2x%26%23178%3B%2B2%E5%88%86%E4%B9%8B%E4%B8%80y%26%23178%3B%EF%BC%89%EF%BC%883xy%2B2x%26%23178%3B-2%E5%88%86%E4%B9%8B%E4%B8%80y%26%23178%3B%EF%BC%89%E8%AE%A1%E7%AE%97)
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(3xy-2x²+2分之一y²)(3xy+2x²-2分之一y²)计算
(3xy-2x²+2分之一y²)(3xy+2x²-2分之一y²)计算
(3xy-2x²+2分之一y²)(3xy+2x²-2分之一y²)计算
(3xy-2x²+2分之一y²)(3xy+2x²-2分之一y²)
=[3xy-(2x²-1/2y²)][3xy+(2x²-1/2y²)]
=9x²y²-(2x²-1/2y)²
=9x²y²-4x^4+2x²y²-1/4y^4
=11x²y²-4x^4-1/4y^4