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4Soluciones a las actividades de cada epígrafe 14 Calcula. a) 6 + [5 + (7 + 2)] b) 8 + [4 – (3 + 5)] c) 10 – [6 + (2 + 7)] d) 15 – [2 – (6 – 10)] e) 15 – [10 – (8 + 4)] f) 12 – [7 – (2 – 10)] g) (–6 ) + [5 + (2 – 12)] h) (–7) – [3 – (4 – 9)] a) 6 + [5 + (7 + 2)] = 20 b) 8 + [4 – (3 + 5)] = 4 c) 10 – [6 + (2 + 7)] = –5 d) 15 – [2 – (6 – 10)] = 9 e) 15 – [10 – (8 + 4)] = 17 f) 12 – [7 – (2 – 10)] = –3 g) (–6 ) + [5 + (2 – 12)] = –11 h) (–7) – [3 – (4 – 9)] = –15 15 Calcula. a) (2 – 10) + [5 – (8 + 2)] b) (12 – 3) – [1 – (2 – 6)] c) [9 – (+5)] + [7 + (–10)] d) [10 – (–2)] – [5 – (+12)] e) [8 – (6 + 4)] – (5 – 7) f) [1 + (6 – 9)] – (8 – 12) a) (2 – 10) + [5 – (8 + 2)] = –13 b) (12 – 3) – [1 – (2 – 6)] = 4 c) [9 – (+5)] + [7 + (–10)] = 1 d) [10 – (–2)] – [5 – (+12)] = 19 e) [8 – (6 + 4)] – (5 – 7) = 0 f) [1 + (6 – 9)] – (8 – 12) = 2 PÁGINA 87 1 Escribe en forma de producto las siguientes expresiones: a) +(–7) + (–7) + (–7) b) –(+3) – (+3) – (+3) – (+3) c) +(+2) + (+2) + (+2) d) –(–3) – (–3) – (–3) – (–3) – (–3) e) +(–20) + (–20) + (–20) + (–20) a) +(–7) + (–7) + (–7) = (+3) · (–7) b) –(+3) – (+3) – (+3) – (+3) = (–4) · (–3) c) +(+2) + (+2) + (+2) = (+3) · (+2) d) –(–3) – (–3) – (–3) – (–3) – (–3) = (–5) · (–3) e) +(–20) + (–20) + (–20) + (–20) = (+4) · (–20) 2 Calcula estos productos: a) 3 · (–2) b) 4 · (+5) c) 8 · (–6) d) –5 · (+3) e) –2 · (–4) f) –6 · (+3) g) (–4) · (+7) h) (+2) · (+6) i) (–5) · (–7) j) (+3) · (–8) k) (–9) · (–3) l) (–6) · (+4) a) 3 · (–2) = –6 b) 4 · (+5) = +20 c) 8 · (–6) = –48 d) –5 · (+3) = –15 e) –2 · (–4) = +8 f) –6 · (+3) = –18 g) (–4) · (+7) = –28 h) (+2) · (+6) = +12 i) (–5) · (–7) = +35 j) (+3) · (–8) = –24 k) (–9) · (–3) = +27 l) (–6) · (+4) = –24 Unidad 4. Los números enteros Pág. 12
4Soluciones a las actividades de cada epígrafe 3 Copia y completa el factor desconocido. a) (–6) · = –18 b) (+8) · = –24 c) (–7) · = +35 d) (+15) · = +60 a) (–6) · (+3) = –18 b) (+8) · (–3) = –24 c) (–7) · (–5) = +35 d) (+15) · (+4) = +60 4 Calcula el cociente entero, si existe. a) (–8) : (+2) b) (+20) : (–10) c) (–12) : (–4) d) (–4) : (+3) e) (+20) : (–7) f) (–1) : (+6) g) (–15) : (–3) h) (+32) : (+8) i) (–36) : (+9) j) (+42) : (–7) k) (–48) : (–8) l) (+54) : (+6) a) (–8) : (+2) = –4 b) (+20) : (–10)= –2 c) (–12) : (–4) = +3 d) (–4) : (+3) No entero e) (+20) : (–7) No entero f) (–1) : (+6) No entero g) (–15) : (–3) = +5 h) (+32) : (+8) = +4 i) (–36) : (+9) = –4 j) (+42) : (–7) = –6 k) (–48) : (–8) = +6 l) (+54) : (+6) = +9 5 Escribe: a) Tres divisiones de enteros cuyo cociente sea entero. b) Tres divisiones de enteros cuyo cociente no sea entero. Solución abierta. 6 Calcula. a) (+3) · (–5) · (+2) b) (–4) · (–1) · (+6) c) (–2) · (–7) · (–2) d) (+5) · (–4) · (–3) a) (+3) · (–5) · (+2) = –30 b) (–4) · (–1) · (+6) = +24 c) (–2) · (–7) · (–2) = –28 d) (+5) · (–4) · (–3) = +60 7 Opera. a) [(+80) : (–8)] : (–5) b) [(–70) : (–2)] : (–7) c) (+50) : [(–30) : (+6)] d) (–40) : [(+24) : (+3)] a) [(+80) : (–8)] : (–5) = [–10] : (–5) = +2 b) [(–70) : (–2)] : (–7) = [+35] : (–7) = –5 c) (+50) : [(–30) : (+6)] = (+50) : [–5] = –10 d) (–40) : [(+24) : (+3)] = (–40) : [+8] = –5 Unidad 4. Los números enteros Pág. 13
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