Enteros - Cepasanfrancisco.edurioja.org

4Soluciones a los ejercicios y problemas
15 Calcula.
a) 13 – (6 + 5) b) 8 – (6 + 5)
c) (4 + 8) – (3 – 9) d) 10 + (8 – 15 + 2 – 6)
e) 12 – (7 + 11 – 14 – 8) f) (6 – 12 + 2) – (11 – 4 + 2 – 5)
a) 13 – (6 + 5) = 2 b) 8 – (6 + 5) = –3
c) (4 + 8) – (3 – 9) = +18 d) 10 + (8 – 15 + 2 – 6) = –1
e) 12 – (7 + 11 – 14 – 8) = 16 f) (6 – 12 + 2) – (11 – 4 + 2 – 5) = –8
17 Calcula.
a) (5 – 7) – [(–3) + (–6)] b) (–8) + [(+7) – (–4) + (–5)]
c) (+9) – [(+3) – (3 – 12) – (+8)] d) [(+6) – (–8)] – [(–4) – (–10)]
e) [(2 – 8) + (5 – 7)] – [(–9 + 6) – (–5 + 7)]
a) (5 – 7) – [(–3) + (–6)] = +7
b) (–8) + [(+7) – (–4) + (–5)] = –2
c) (+9) – [(+3) – (3 – 12) – (+8)] = +5
d) [(+6) – (–8)] – [(–4) – (–10)] = +8
e) [(2 – 8) + (5 – 7)] – [(–9 + 6) – (–5 + 7)] = –3
M
ultiplicación y división
18 Recuerda la regla de los signos y multiplica.
a) (+7) · (–8) b) (–6) · (–9) c) (+5) · (+11)
d) (+5) · (–12) e) (–3) · (+20) f) (–5) · (–15)
a) (+7) · (–8) = –56 b) (–6) · (–9) = +54 c) (+5) · (+11) = +55
d) (+5) · (–12) = –60 e) (–3) · (+20) = –60 f) (–5) · (–15) = +75
19 Calcula.
a) (–5) · (+2) · (–3) b) (–4) · (–1) · (–7)
c) (+4) · (+5) · (–2) d) (+6) · (–3) · (–1)
a) (–5) · (+2) · (–3) = +30 b) (–4) · (–1) · (–7) = –28
c) (+4) · (+5) · (–2) = –40 d) (+6) · (–3) · (–1) = +18
20 Recuerda la regla de los signos y divide.
a) (+24) : (–8) b) (–140) : (+7)
c) (–130) : (–13) d) (+77) : (–7)
e) (–18) : (–1) f) (–156) : (–13)
a) (+24) : (–8) = –3 b) (–140) : (+7) = –20
c) (–130) : (–13) = +10 d) (+77) : (–7) = –11
e) (–18) : (–1) = +18 f) (–156) : (–13) = +12
Unidad 4. Los números enteros
Pág. 4