Question

упростите выражение ( $( frac{1}{m-n} - frac{1}{m+n}): frac{2}{3m-3n}=$

Answer 1

(1/(m-n)-1/(m+n)):2/(3m-3n)=
=((m+n-m+n)/(m-n)(m+n)). 3(m-n)/2=
=(2n/(m-n)(m+n)).3(m-n)/2=
=(2n/(m+n)).3/2=3n/(m+n)