Factor común

Ejercicio nº 3

Sacar factor común en las expresiones:

Soluciones:

1 3 · 2 + 3 · (−5) =

= 3 · [2 + (−5)] =

= 3 · (2 − 5) =

= 3 · (−3) = −9

2 (−2) · 12 + (−2) · (−6) =

= (−2) · [12 + (−6)] =

= (−2) · (12 − 6) =

= (−2) · 6 = −12

3 8 · 5 + 8 =

= 8 · (5 + 1) =

= 8 · 6 = 48

4 (−3) · (−2) + (−3) · (−5) =

= (−3) · [(−2) + (−5)] =

= (−3) · (−2 − 5) =

= (− 3) · (−7) = 21