Question

[(3/5-2/7).(3/4+1/8)]:(5/2-2/5)

Answer 1

Vamos là.

por parte

3/5 - 2/7 = 21/35 - 10/35 = 11/35

3/4 + 1/8 = 6/8 + 1/8 = 7/8

5/2 - 2/5 = 25/10 - 4/10 = 21/10

agora

E = (11/35)*(7/8)/(21/10)

E = (11/40)/(21/10) = (11/40)*(10/21) = 11/84