Question

Efetue
a) 3/8+1/8

b) 3/10-4/15

c) 1/4-1/6

d) 1/2+1/3+1/5

Efetue a) 2/5×3/7

b) 2/5+3/7

c) 2/3×3/4×5/2

d) (1+2/4÷7/2

Por favor alguém me ajude

Answer 1

Oi....

1ª

a)

3/8 + 1/8

3 + 1/8

4/8 ÷ 4

1/2

b)

3/10 - 4/15 ⇒mmc = 30

9 - 8/30

1/30

c)

1/4 - 1/ 6 ⇒mmc = 12

3 - 2/12

1/12

d)

1/2 + 1/3 + 1/5⇒mmc = 30

15 + 10 + 6/30

31/30

2ª

a)

2/5 × 3/7

6/35

b)

2/5 + 3/7 ⇒ mmc = 35

14 + 15/35

29/35

c)

2/3 × 3/4 × 5/2

1/4 × 5

5/4

d)

1 + 2/4 ÷ 7/2

1 + 1/2 × 7/2

1 + 1/7 ⇒mmc =7

7 + 1/7

8/7

Espero ter ajudado.