计算:3xy(x²y-xy²+xy)-xy²(2x-xy+2x)

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计算:3xy(x²y-xy²+xy)-xy²(2x-xy+2x)计算:3xy(x²y-xy²+xy)-xy²(2x-xy+2x)计算:3xy

计算:3xy(x²y-xy²+xy)-xy²(2x-xy+2x)
计算:3xy(x²y-xy²+xy)-xy²(2x-xy+2x)

计算:3xy(x²y-xy²+xy)-xy²(2x-xy+2x)
原式=3x³y²-3x²y³+3x²y²-2x²y²+x²y³-2x²y²
=3x³y²-2x²y³-x²y²