(-2x³y 4次方)/(-x²y²)*(-x)-(x-2y)(2y+x)-x(xy²-x)
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(-2x³y 4次方)/(-x²y²)*(-x)-(x-2y)(2y+x)-x(xy²-x)
(-2x³y 4次方)/(-x²y²)*(-x)-(x-2y)(2y+x)-x(xy²-x)
(-2x³y 4次方)/(-x²y²)*(-x)-(x-2y)(2y+x)-x(xy²-x)
你二次方是怎么打上去的?