Resposta:
Explicação passo-a-passo:
a + b =
1/3 + 2/5 =
5/15 + 6/15 =
11/15
ab = 1/3 . 2/5
ab = 2/15
( a + b ) / ab =
11/15 : 2/15 =
11/15 x 15/2 =
11/2 =
10/2 + 1/2 =
5 + 1/2 =
5 1/2
ok
