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x+ 1/2 + x +2/3 + x+3/4 + ... x +99/100 = 99 . Cum se rezolva ? 

Răspuns :

x(1/2+2/3+3/4+........+99/100)=99
x(99/100·100/100 :2)=99       
x·99/50=99
x=99:99/50
x=99·50/99
x=50
Sper sa intelegi.