(-2x^n+1y^n)·(-3xy)·(-1/2x²z)计算

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(-2x^n+1y^n)·(-3xy)·(-1/2x²z)计算(-2x^n+1y^n)·(-3xy)·(-1/2x²z)计算(-2x^n+1y^n)·(-3xy)·(-1/2x&#

(-2x^n+1y^n)·(-3xy)·(-1/2x²z)计算
(-2x^n+1y^n)·(-3xy)·(-1/2x²z)计算

(-2x^n+1y^n)·(-3xy)·(-1/2x²z)计算
(-2x^n+1y^n)·(-3xy)·(-1/2x²z)
=-3x^(n+4)y^(n+1)z