Question

Calcule o valor das expressões e apresente o resultado na forma de fração irredutível.

A) 0,5+1/4.1/3=
B) 1/2+1/3:5/6=
C) 1/4.0,5+1/2=
D) 15:(3/4-1/4)=
E) (3+1/2).4/5=
F)(0,75+1/4):2/5+1/2=

Answer 1

A)
0,5 + 1/4 * 1/3 = 1/2 + 1/12 = (6 + 1) / 12 = 7/12

B)
1/2 + 1/3 : 5/6 = 1/2 + 1/3 * 6/5 = 1/2 + 2/5 = (5 + 4) / 10 = 9/10

C)
1/4 * 0,5 + 1/2 = 1/4 * 1/2 + 1/2 = 1/8 + 1/2 = (1 + 4) / 8 = 5/8

D)
15 : (3/4 - 1/4) = 15 : 2/4 = 15 : 1/2 = 15 * 2 = 30

E)
(3 + 1/2) * 4/5 = ((6+1) / 2) * 4/5 = 7/2 * 4/5 = 14/5

F)
(0,75 + 1/4) : 2/5 + 1/2 = (3/4 + 1/4) : 2/5 + 1/2  = 1 : 2/5 + 1/2 = 1 * 5/2 + 1/2 = 5/2 + 1/2 = 6/2 = 3

Answer 2

Resposta:

Explicação passo-a-passo:

a)0,5+1/4×1/3

0,5 + 1/12

1/2 + 1/12

MMC de 2 e 12 = 12

6/12 + 1/12

7/12

b)1/2+1/3÷1/6

1/2 + 1/3 * 6/1

1/2 + 6/3

1/2 + 2

MMC de 2 e 1 = 2

1/2 + 4/2

5/2

c)1/4×0,5+1/2

1/4 * 1/2 + 1/2

1/8 + 1/2

MMC de 8 e 2 = 8

1/8 + 4/8

5/8

d)15÷(3/4-1/4)

15 ÷ 2/4

15/1 * 4/2

60/2

30

e) (3+1/2)×4/5

MMC de 1 e 2 = 2

(6/2 + 1/2) × 4/5

7/2 × 4/5

28/10 (simplificar por 2)

14/5

f) (0,75+1/4)÷2/5+1/2

(3/4+1/4)÷2/5 + 1/2

4/4 ÷ 2/5 + 1/2

1 ÷ 2/5 + 1/2

1/1 * 5/2 + 1/2

5/2 + 1/2

6/2

3