ab-ac
mn-m
9x-3y
4,5m+1,5n
mnk-mn
abc+ab

ab-ac = a(b - c)mn-m = m(n - 1)9x- 3y = 3(3x - y)4,5m+1,5n = 1.5(3m + n)mnk - mn = mn(k - 1)abc+ab = ab(c + 1)

а(b-c)m(n-1)3(3-y)1,5(3+n)mn(k-1)ab(c+1)