-8+4 3/7+2 11/21 Помогите пожалуйста
-8+4 9/21+2 11/21=-1 1/21
- 8 + 4 3/7 + 2 11/21 = - 8 + 31/7 + 53/21 =(-8 *21 + 31 * 3 + 53 *1)/21 = -168/21 + 93/21 + 53/21 = - 22/21 = - 1 1/21