Question

determine o valor de a) 1/3+1/2 b)1/7+1/5 c)1/8+1/5 ​

Answer 1

Resposta:

a) $\frac{1}{3} + \frac{1}{2}$

Multiplica 3 . 2 = 6

Faz cruzado (2.1) + (3.1)

2+3 = 5

Logo, a =  $\frac{5}{6}$

b) $\frac{1}{7} +\frac{1}{5}$

7 . 5 = 35

(5.1) + (7.1) , 5 + 7 = 12

Logo, b = $\frac{12}{35}$

c) $\frac{1}{8} +\frac{1}{5}$

8 . 5 = 40

(5.1) + (8.1), 5+8 = 13

Logo, c = $\frac{13}{40}$