Divisibilidad - Cepasanfrancisco.edurioja.org

1Soluciones a las actividades de cada epígrafe
25 Calcula.
a) 15 + 2 · [8 – 3 · 5]
b)(–3) · (+5) – 3 · [11 + 3 · (5 – 11)]
c) 28 : (–7) – (–6) · [23 – 5 · (9 – 4)]
d)(–2) · (7 – 11) – [12 – (6 – 8)] : (–7)
e) [18 + 5 · (6 – 9)] – [3 – 16 : (5 + 3)]
a) 15 + 2 · [8 – 3 · 5] = 15 + 2 · [8 – 15] = 15 + 2 · [–7] = 15 – 14 = 1
b) (–3) · (+5) – 3 · [11 + 3 · (5 – 11)] = –15 – 3 · [11 + 3 · (–6)] =
= –15 – 3 · [11 – 18] = –15 – 3 · [–7] = –15 + 21 = 6
c) 28 : (–7) – (–6) · [23 – 5 · (9 – 4)] = (–4) – (–6) · [23 – 5 · (5)] =
= –4 + 6 · [23 – 25] = –4 + 6 · [–2] = –4 + (–12) = –16
d) (–2) · (7 – 11) – [12 – (6 – 8)] : (–7) = (–2) · (–4) – [12 – (–2)] : (–7) =
= 8 – [12 + 2] : (–7) = 8 – [14] : (–7) = 8 – (–2) = 8 + 2 = 10
e) [18 + 5 · (6 – 9)] – [3 – 16 : (5 + 3)] = [18 + 5 · (–3)] – [3 – 16 : 8] =
= [18 + (–15)] – [3 – 2] = [+3] – [+1] = 3 – 1 = 2
PÁGINA 30
26 Escribe en forma de potencia.
a) (–2) · (–2)
b)(+5) · (+5) · (+5)
c) (–4) · (–4) · (–4) · (–4)
d)(–2) · (–2) · (–2) · (–2) · (–2) · (–2)
a) (–2) 2 b) (+5) 3 c) (–4) 4 d) (–2) 6
27 Copia y completa.
Unidad 1. Divisibilidad y números enteros
POTENCIA
(–1)
BASE EXPONENTE VALOR
7
(–2) 4
(+3) 3
(–4) 2
POTENCIA BASE EXPONENTE VALOR
(–1) 7 –1 7 –1
(–2) 4 –2 4 +16
(+3) 3 +3 3 +27
(–4) 2 –4 2 +16
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