VA ROG URGENT!!! Cum calculez 1/1×2+1/2×3+1/3×4+...+1/2016×2017 ?

Răspuns :

Se descompun fractiile : 1-1/2+1/2-1/3+1/3-1/4+.....+1/2016-1/2017 se reduc si ramane 1-1/2017=2016/2017