Resposta :
Explicação passo-a-passo:
A) 2/5 + 1/4 . 6
2/5 + 6/24 =
2/5 + 2/8 =
16/40 + 10 /40 = 26/40
26/40 = 13/20
B) - 8 . ( - 1/10 ) - 1/2
8/10 - 1/2 =
8/10 - 5/10 = 3/10
Explicação passo-a-passo:
A) 2/5 + 1/4 . 6
2/5 + 6/24 =
2/5 + 2/8 =
16/40 + 10 /40 = 26/40
26/40 = 13/20
B) - 8 . ( - 1/10 ) - 1/2
8/10 - 1/2 =
8/10 - 5/10 = 3/10