Question

计算：m−m2m2−1÷mm−1•(−m+1m−1)2．

Answer 1

原式=

m(1−m)

(m+1)(m−1)÷

m

m−1•

(m+1)2

(m−1)2

=

−m(m−1)

(m+1)(m−1)•

m−1

m•

(m+1)2

(m−1)2

=−

m+1

m−1．