Question

28 Resuelve por dos métodos diferentes.

Primero quitando paréntesis Primero operando dentro del paréntesis

a) 5 – (9 – 3) = 5 – 9 + 3 = 8 - 9 = -1 5 – (+6) = 5 – 6 = -1
b) 7 + (2 – 8) =
c) 12 + (–3 + 10) =
d) 15 – (8 + 11) =
e) +(9 – 10) – 2 =
f) –(7 + 4) + 14 =
g) (5 + 8) – (7 + 6) =
h) (16 – 9) – (10 – 7) =

Answer 1

Respuesta:  

b) 7 + (2 – 8) = 7 + (–6) = 7 – 6 = 1 .

     7 + (2 – 8) = 7 + 2 – 8 = 9 – 8 = 1

c) 12 + (–3 + 10) = 12 + (+7) = 12 + 7 = 19

    12 + (–3 + 10) = 12 – 3 + 10 = 22 – 3 = 19

d) 15 – (8 + 11) = 15 – (+19) = 15 – 19 = –4

    15 – (8 + 11) = 15 – 8 – 11 = 15 – 19 = –4

e) +(9 – 10) – 2 = 9 – 10 – 2 = 9 – 12 = –3

   +(9 – 10) – 2 = +(–1) – 2 = –1 – 2 = –3

f) –(7 + 4) + 14 = –(+11) + 14 = –11 + 14 = 3

   –(7 + 4) + 14 = –7 – 4 + 14 = –11 + 14 = 3

g) (5 + 8) – (7 + 6) = (+13) – (+13) = 13 – 13 = 0

  (5 + 8) – (7 + 6) = 5 + 8 – 7 – 6 = 13 – 13 = 0

h) (16 – 9) – (10 – 7) = (+7) – (+3) = 7 – 3 = 4

(16 – 9) – (10 – 7) = 16 – 9 – 10 + 7 = 23 – 19 = 4

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