Question

calcule o valor das expressões:
a) 2/5 + 1/2 - 1/3 =
b) 3/4 × 5/6 + 1/2=
c) 2/3 + 1/4 × 3=
d) 3/4 : 1/2 - 2/3 =
e) 3/5 + 1/5 : 1/10 =
f) 2 1/2 + 3/2 × 1/2 = ​

Answer 1

Oi....

a)

2/5 + 1/2 - 1/3⇒o mmc de (5,2,3) = 30

12/30 + 15/30 - 10/30

27/30 - 10/30

17/30

b)

3/4 × 5/6 + 1/2

1/4 × 5/2 + 1/2

5/8 + 1/2 ⇒ mmc = 8

5 + 4/ 8

9/8

c)

2/3 + 1/4 × 3

2/3 + 3/4⇒mmc = 12

8 + 9/12

17/12

d)

3/4 ÷ 1/2 - 2/3

3/4 × 2 - 2/3

6/4 - 2/3

3/2 - 2/3 ⇒ 6

9 - 4/6

5/6

e)

3/5 + 1/5 ÷ 1/10

3/5 + 1/5 × 10

3/5 + 2⇒mmc = 5

3 + 10/5

13/5

f)

2 1/2 + 3/2 × 1/2

5/2 + 3/2 × 1/2

5/2 + 3/4 ⇒ mmc = 4

10 + 3/4

13/4

Espero ter ajudado.