Răspuns:
b) - 5/6
d) - 43/72
Explicație pas cu pas:
b) (- 5/12) - [(- 1/2) + (+ 3/4) - (- 1/6)] =
- 5/12 - ( - 1/2 + 3/4 + 1/6) =
- 5/12 - 5/12 = - 10/12 (simplificare cu 2) =
- 5/6 sau - 0,8(3)
✩
d) (-8/9) - [- 5/72 - (-1/12) + (-11/36)] =
- 8/9 - (-5/72 + 1/12 - 11/36) =
- 8/9 - (- 7/24) =
- 8/9 + 7/24 =
- 43/72 sau - 0,597(2)
