计算:(x-y)(1/9x-y)-(1/3x-y)(1/3x+y)
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计算:(x-y)(1/9x-y)-(1/3x-y)(1/3x+y)
计算:(x-y)(1/9x-y)-(1/3x-y)(1/3x+y)
计算:(x-y)(1/9x-y)-(1/3x-y)(1/3x+y)
:(x-y)(1/9x-y)-(1/3x-y)(1/3x+y)
=x^2/9-10xy/9+y^2-x^2/9+y^2
=2y^2-10xy/9
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