计算:3x²•(-3xy)²-x²•(x²y²
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计算:(xy-x²)乘 x-y分之xy
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(xy-x²)²÷(x-y)²/xy·x-y/x² 计算
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计算3x/8y×16y²/27x² (2xy-x²)÷x-2y/xy 2x-6/x
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(x²-y²)·6x/3xy-3x²计算
计算(1)3x/8y×16y²/27x² (2)(2xy-x²)÷x-2y/xy 2x-6
计算:(-3x²y²)²•(2xy)³÷(xy)²