代数式2m=3n,则m/(m+n)-m/(m-n)-2n^2/(m^2-n^2)=
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代数式2m=3n,则m/(m+n)-m/(m-n)-2n^2/(m^2-n^2)=代数式2m=3n,则m/(m+n)-m/(m-n)-2n^2/(m^2-n^2)=代数式2m=3n,则m/(m+n)-
代数式2m=3n,则m/(m+n)-m/(m-n)-2n^2/(m^2-n^2)=
代数式2m=3n,则m/(m+n)-m/(m-n)-2n^2/(m^2-n^2)=
代数式2m=3n,则m/(m+n)-m/(m-n)-2n^2/(m^2-n^2)=
m/(m+n)-m/(m-n)-2n^2/(m^2-n^2)
= m(m-n)/(m^2-n^2)-m(m+n)/(m^2-n^2)-2n^2/(m^2-n^2)
= (m^2-mn-m^2-mn-2n^2)/(m^2-n^2)
= 2n(m+n)/(n+m)(n-m)
= 2n/(n-m)
2m=3n m=1.5n
2n/(n-m)=-4
代数式2m=3n,则m/(m+n)-m/(m-n)-2n^2/(m^2-n^2)=
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