Question

Gente, alguém pode me ajudar?

Answer 1

a= 4-1/3 = 12-1/3 = 11/3 
1/5+1 = 5=1/5 = 6/5  
6/5 .11/3 = 66/15 ou 22/5

1/8+ 139/40 = mmc= 8.5 = 40
5+139/40  = 144/40
assim 
22/5/144/40 =
22.40/144.5 = 22.8/144  11.8 / 72 = 11/9

b= 3/4 .2 = 3/2 
7/8+ 3/5 =  35+24/40 =  59/40 
3/2.59/40 =  177/80