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Aplicando la propiedad distributiva.
a)
2 × (3 - 5)
6 - 10
- 4
....................................................................
b)
4 × ( - 8 + 6)
- 32 + 24
- 8
..................................................................................
c)
(7 + 3) × 6
42 + 18
60
....................................................................
d)
(9 - 21) × ( - 14 - 2)
( - 12) × ( - 16)
192
..................................................................