Question

3) Utilizando a propriedade associativa da multiplicação resolva cada questão de duas maneiras diferentes.
a) 4 x 5 x 10=
b) 9 x 10 x 12=
c) 11 x 12 x 13 x 14=
d) 7 x 15 x 8=
e) 3 x 4 x 5 x 6 x 8=
f) 10 x 4 x 5 x 2=
g) 420 x 19 x 4=
h) 99 x 8 x 3=

Answer 1

Resposta:

a) 200

b) 1080

c) 24024

d) 840

e) 2880

f) 400

g) 31920

h) 2376

Explicação passo-a-passo:

a) 4 x 5 x 10 = (4 x 5) x 10 = 20 x 10 = 200

   4 x 5 x 10 = 4 x (5 x 10) = 4 x 50 = 200

b) 9 x 10 x 12 = (9 x 10) x 12 = 90 x 12 = 1080

   9 x 10 x 12 = 9 x (10 x 12) = 9 x 120 = 1080

c) 11 x 12 x 13 x 14 = (11 x 12) x (13 x 14) = 132 x 182 = 24024

   11 x 12 x 13 x 14 = (11 x 14) x (12 x 13) = 154 x 156 = 24024

d) 7 x 15 x 8 = (7 x 15) x 8 = 105 x 8 = 840

   7 x 15 x 8 = 7 x (15 x 8) = 7 x 120 = 840

e) 3 x 4 x 5 x 6 x 8 = (3 x 4 x 5) x (6 x 8) = 60 x 48 = 2880

   3 x 4 x 5 x 6 x 8 = (3 x 4) x (5 x 6 x 8) = 12 x 240 = 2880

f) 10 x 4 x 5 x 2 = 10 x (4 x 5 x 2) = 10 x 40 = 400

  10 x 4 x 5 x 2 = (10 x 4) x (5 x 2) = 40 x 10 = 400

g) 420 x 19 x 4 = 420 x (19 x 4) = 420 x 76 = 31920

   420 x 19 x 4 = (420 x 4) x 19 = 1680 x 19 = 31920

h) 99 x 8 x 3 = 99 x (8 x 3) = 99 x 24 = 2376

   99 x 8 x 3 = (99 x 3) x 8 = 297 x 8 = 2376