enteros operaciones

Calcula:

- a) 3-5+6-12 =
- b) (-5) \cdot (-4) =
- c) 5 -2 \cdot (3-7) =
- d) (2-22): (8-4) =

SOLUCIÓN

- a) 3-5+6-12 =
3+6-5-12 =
9-17 = \fbox{-8}

- b) (-5) \cdot (-4) = \fbox{+20}

- c) 5 -2 \cdot (3-7) =
5 -2 \cdot (-4) =
5 +8 = \fbox{13}

- d) (2-22): (8-4) = (-20) : 4 = \fbox{-5}