m的平方-2m+1分之m的平方-1 = (m^2 - 1 )/(m-1)^2 = (m+1)/(m-1)
1+1/m = (1+m)/m
一除就是(1+m)/m * (m-1)/(m+1) = (m-1)/m
化简:(1+m分之1)除以m的平方-2m+1分之m的平方-1
m的平方-2m+1分之m的平方-1 = (m^2 - 1 )/(m-1)^2 = (m+1)/(m-1)
1+1/m = (1+m)/m
一除就是(1+m)/m * (m-1)/(m+1) = (m-1)/m