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

3(2x²y-3xy²)-(xy²-3x²y)
=6x²y-9xy²-xy²+3x²y
=9x²y-10xy²
=-9/4-5
=-29/4