625a2b-125ab2 / 25a2b2
choices
25(a-b) / ab
25(25a-5b) / ab
5(a-b) / ab
5(5a-b) / ab
If you meant: (625a²b - 125ab²) / 25a²b²:
Factor the numerator; a common factor is 125ab: 125ab(5a - b) / 25a²b²
Cancel: 5(5a - b) / ab
