Question

1) Efetue os cálculos, simplificando quando possível:
a) 8x5/4x2
b) 2/5 + 1/8 +3/4
c) 4/7 + 5/7
d) 7/12+5/6–1/3
e) 20/3 x 7/5 x 3/14
f) 6/7x1/3+9/4:3/2–5/14
g) 8/5 : 2/15

Answer 1

Resposta:

A) 5

B) 51/40

C) 9/7

D) 13/12

E) 10/3

F)10/7

G) 12

Explicação passo-a-passo:

A)8×5/4×2

40/8= 5/1 = 5

B)2/5 + 1/8 + 3/4

(Coloca em denominador comum)

16/40 + 5/40 + 30/40 = 51/40

C/7 + 5/7 = 9/7

D)7/12 + 5/6 - 1/3

(Coloca em denominador comum)

7/12 + 10/12 - 4/12 = 13/12

E) 20/3 × 7/3 × 3/14

140/9 × 3/14

(Simplificando cruzado)

10/3 × 1/1 = 10/3

F)6/7 × 1/3 + 9/4 ÷ 3/2 - 5/14

6/21 + 9/4 × 2/3 - 5/14

6/21 + 18/12 - 5/14

(Simplificando)

2/7 + 3/2 - 5/14

(Coloca em denominador comum)

4/14 + 21/14 - 5/14 = 20/14 = 10/7

G) 8/5 ÷ 2/15

8/5 × 15/2 = 120/10 = 12/1 = 12