x=3,y=-1/3,求3x05[2xy²-2(xy-3/2x²y)]
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![x=3,y=-1/3,求3x05[2xy²-2(xy-3/2x²y)]](/uploads/image/z/3169376-8-6.jpg?t=x%3D3%2Cy%3D-1%2F3%2C%E6%B1%823x05%5B2xy%26%23178%3B-2%28xy-3%2F2x%26%23178%3By%29%5D)
x=3,y=-1/3,求3x05[2xy²-2(xy-3/2x²y)]
x=3,y=-1/3,求3x05[2xy²-2(xy-3/2x²y)]
x=3,y=-1/3,求3x05[2xy²-2(xy-3/2x²y)]
原式=x²(2xy²-2xy+3x²y)
=2x³y²-2x³y+3x⁴y
=2*27*1/9-2*27*(-1/3)+3*81*(-1/3)
=6+18-81
=-57