问题描述: 已知m方减n方等于mn,求n方分之m方加m方分之n方的值 1个回答 分类:数学 2014-10-14 问题解答: 我来补答 已知m^2-n^2=mn求m^2/n^2+n^2/m^2通分得m^4+n^4/m^2n^2而m^4+n^4=m^4-2m^2n^2+n^4+2m^2n^2=(m^2-n^2)^2-2m^2n^2=(mn)^2-2m^2n^2=-m^2n^2所以原式=(-m^2n^2)/(m^2n^2)=-1 展开全文阅读