Question

1) Resolva as operações de adição e subtração com frações:
a) 2/3 + 3/4
b) 5/8 + 4/15
c) 7/12 + 5/4
d) 4/5 + 7/6​

Answer 1

Resposta:

1)

a) 17/12

b) 107/120

c) 11/6

d) 59/30

Explicação:

a) 2/3+3/4 =

(12÷3×2)+(12÷4×3/12 =

(4×2)+(3×3)/12 =

8+9/12 =

17/12

b) 5/8+4/15 =

(120÷8×5)+(120÷15×4)/120 =

(15×5)+(8×4)/120 =

75+32/120 =

107/120

c) 7/12+5/4 =

(12÷12×7)+(12÷4×5)/12 =

(1×7)+(3×5)/12 =

7+15/12 =

22/12

22/12 = 22÷2/12÷2 = 11/6

d) 4/5+7/6 =

(30÷5×4)+(30÷6×7)/30 =

(6×4)+(5×7)/30 =

24+35/30 =

59/30