Question

qual o valor das expressões numericas

Answer 1

a) 2/3 : 4/5 + 1/2
3/2 . 4/5 + 1/2
12/10 + 1/2
MMC 10 e 2 = 10
$\frac{12 + 5}{10}$
17/10

b) 1/2 - 5/8 : 5/4
1/2 - 5/8 . 4/5
1/2 - 20/40
1/2 - 1/2 = 0