Resposta:
4)
(3/5)/4=(3/5)×(1/4)=3/20
5)
[1+((1/5)-2)/3]/(2/3)-1
[1-(9/5)/3]/(-1/3)
[1-(9/5*1/3)]/(-1/3)
(1-3/5)/(-1/3)
(2/5)*-3
-6/5
Alternativa c
6) 5-¹ + 5-²= 5-³
Alternativa A
