(1)m²/(m-n)+n²/(n-m)=m²/(m-n)-n²/(m-n)=(m²-n²)/(m-n)=(m+n)(m-n)/(m-n)=m+n(2)(x-3)/(1-x)-(1-x)/(x-1)=(x-3)/(1-x)+1=(x-3+1-x)/(1-x)=-2/(1-x)(3)1/(1-a)-1/(a-1)+3a/(a-1)=(1...
(1)m^2/m-n+n^2/n-m (2)x-3/1-x-1-x/x-1(3)1/1-a-1/a-1+3a/a-1怎么
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