1/2 +1/3 +1/4 +1/5 va rog cum se rezolva

1/2 + 1/3 + 1/4+ 1/5 =  30/60 + 20/60 + 15/60 + 12/60 = 77/60 = 1 intreg 17/60 

1/2+1/3+1/4+1/5 30+20+15+12 totul supra 60 =77/60 =1,28(3)