Question

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

Answer 1

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)

Answer 2

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