Question

faça a adição das frações
a)1/2+2/5
b)4/1+7/2
c)3/5+2/4
d)4/8+2/6

faça a subtração das frações
a)1/2-2/5
b)4/7-1/2
c)3/5-2/4
d)4/8-2/6

faça a multiplicação das frações
a)1/2×2/5
b)4/7×1/2
c)3/5×2/4
d)4/8×2/4

faça a divisão das frações
a)1/2÷2/5
b)4/7÷1/2
c)3/5÷2/4
d)4/8÷2/6​

Answer 1

Explicação passo-a-passo:

1-a) 1/2 + 2/5

   5/10 + 4/10

        9/10

b) 4/1 + 7/2

   8/2 + 7/2

      15/2

c) 3/5 + 2/4

12/20 + 10/20

22/20= 11/10

d) 4/8 + 2/6

 12/24 + 8/24

 20/24= 5/6

2-a) 1/2 - 2/5

    5/10 - 4/10

        1/10

b) 4/7 - 1/2

 8/14 - 7/14

     1/14

c) 3/5 - 2/4

12/20 - 10/20

2/20= 1/10

d) 4/8 -2/6

12/24 - 8/24

4/24= 1/6

3-a) 1/2 × 2/5

      2/10= 1/5

b) 4/7 × 1/2

  4/14= 2/7

c) 3/5 × 2/4

  6/20= 3/10

d) 4/8 × 2/4

   8/32= 1/4

4-a) 1/2 : 2/5

      1/2 × 5/2

          5/5

b) 4/7 : 1/2

  4/7 × 2/1

      8/7

c) 3/5 : 2/4

  3/5 × 2/1

     6/5

d) 4/8 : 2/6

   1/2 × 3/1

      3/2