3(2x²y-3xy²)-(xy²-3x²y),其中x=二分之一,y=-1
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![3(2x²y-3xy²)-(xy²-3x²y),其中x=二分之一,y=-1](/uploads/image/z/401930-26-0.jpg?t=3%282x%26%23178%3By-3xy%26%23178%3B%29-%28xy%26%23178%3B-3x%26%23178%3By%29%2C%E5%85%B6%E4%B8%ADx%3D%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%80%2Cy%3D-1)
3(2x²y-3xy²)-(xy²-3x²y),其中x=二分之一,y=-1
3(2x²y-3xy²)-(xy²-3x²y),其中x=二分之一,y=-1
3(2x²y-3xy²)-(xy²-3x²y),其中x=二分之一,y=-1
3(2x²y-3xy²)-(xy²-3x²y)
=6x²y-9xy²-xy²+3x²y
=9x²y-10xy²
=-9/4-5
=-29/4