Ответы и объяснения

2013-05-27T21:10:30+04:00

(3mn-2m+12n-8)/(4-12n+9n^2)=(3n(4+m)-2(m+4))/(3n-2)^2=((3n-2)(4+m))/((3n-2)(3n-2))=(4+m)/(3n-2)