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)
1/9x^2-10/9xy+y^2-(1/9x^2-y^2)
=-10/9xy+2y^2
=2y(y-5/9x)
代数式化简吗?化简以后就是
2y^2-(10xy/9)
1/9x^2-10/9xy+y^2-1/9x^2+y^2=2y^2-10/9xy
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