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(x+a)/(y+a)>x/y. [証明] y>x>0、a>0、ay>ax、xy+ay>xy+ax、(x+a)y>(y+a)x.······① y>0、a>0、y+a>0、y(y+a)>0。 1の両辺をy(y+a)で割って、(x+a)/(y+a)>x/y.
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