Помогите сократите дроби

Question

Помогите сократите дроби

---

Answer 1

1) (x + 1)(x - 3) / (x + 1)( x - 1) = (x - 3) / (x - 1)
2) (x - 1)(x + 7.5) / (x - 1)^2 = (x + 7.5) / (x - 1)
3) (a + 1)(a + 4) / (a + 4)(a - 5) = (a + 1) / (a - 5)
4) (b - 3)(b + 7) / (b - 1)(b + 7) = (b - 3) / (b - 1)