化简求值(xy-x²)/xy分之x²-2xy+y²乘x²分之x-y,其中y=二分之一
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![化简求值(xy-x²)/xy分之x²-2xy+y²乘x²分之x-y,其中y=二分之一](/uploads/image/z/1611784-64-4.jpg?t=%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC%28xy-x%26%23178%3B%29%2Fxy%E5%88%86%E4%B9%8Bx%26%23178%3B-2xy%2By%26%23178%3B%E4%B9%98x%26%23178%3B%E5%88%86%E4%B9%8Bx-y%2C%E5%85%B6%E4%B8%ADy%3D%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%80)
化简求值(xy-x²)/xy分之x²-2xy+y²乘x²分之x-y,其中y=二分之一
化简求值(xy-x²)/xy分之x²-2xy+y²乘x²分之x-y,其中y=二分之一
化简求值(xy-x²)/xy分之x²-2xy+y²乘x²分之x-y,其中y=二分之一
(xy-x²)÷(x²-2xy+y²)/(x-y)×(x-y)/x²
=-x(x-y)÷(x-y)²/x²
=-x(x-y)×x²/(x-y)²
=-x³/(x-y)
∵x=3/2,y=1/2
∴-x³/(x-y)=-(3/2)³/(3/2-1/2)=-(3/2)³=-27/8