3x(x-y)+2y(x-y) 计算
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3x(x-y)+2y(x-y)计算3x(x-y)+2y(x-y)计算3x(x-y)+2y(x-y)计算=3x²-3xy+2xy-2y²=3x²-xy-2y²很高
3x(x-y)+2y(x-y) 计算
3x(x-y)+2y(x-y) 计算
3x(x-y)+2y(x-y) 计算
=3x²-3xy+2xy-2y²
=3x²-xy-2y²
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3x(x-y)+2y(x-y)
=3x^2-3xy+2xy-2y^2
=3x^2-xy-2y^2
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