Question

Efetue as operações a seguir
A)2/9 + 3/9=
B)7/13 - 2/13=
C)7/10 - 2/10 +4/10=
D )3/5+6/8=
E)1/3-3/4=
F)1/2-3/4+2/5=
G)1/3×2/4=
H)4/7:3/5=
I)(3/8×5/6):4/7=

Answer 1

Oi...

Resolução:

a)

2/9 + 3/9 ⇒mmc = 9

2 + 3/9

5/9

b)

7/13 - 2/13 ⇒mmc = 13

7 - 2/13

5/13

c)

7/10 - 2/10 + 4/10 ⇒ mmc = 10

7 - 2 + 4/10

5 + 4/10

9/10

d)

3/5 + 6/8

3/5 + 3/4⇒mmc 5, 4 = 20

12 + 15/20

27/20

e)

1/3 - 3/4⇒mmc 3, 4 = 12

4 - 9/12

- 5/12

f)

1/2 - 3/4 + 2/5⇒mmc de 2, 4, 5 = 20

10 - 15 + 8/20

18 - 15/20

3/20

g)

1/3 × 2/4

1/3 × 1/2

1/6

h)

4/7 ÷ 3/5

4/7 × 5/3

20/21

i)

(3/8 × 5/6) ÷ 4/7

(1/8 × 5/2) × 7/4

5/16 × 7/4

35/64

Espero ter sido útil.