计算x²y-3x²y

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计算x²y-3x²y计算x²y-3x²y计算x²y-3x²yx²y-3x²y=-2x²y很简单啊=-2x^2y

计算x²y-3x²y
计算x²y-3x²y

计算x²y-3x²y
x²y-3x²y
=-2x²y

很简单啊=-2x^2y

x²y-3x²y=-2x²y