(m+1- 1/(1-m)):(m- m^2/(m-1))=

[tex] \frac{m+1-1}{1-m} : \frac{m-m ^{2} }{m-1} =\frac{m*(m-1)}{m(1-m)(1-m)} = \frac{m-1}{(1-m)(1-m)} =- \frac{m-1}{(m-1)(1-m)}=- \frac{1}{1-m} [/tex]