Question

1/1×2+1/2×3×1/3×4+....+1/44×45=​

Answer 1

1/1*2+1/2*3+...+1/44*45=

Ex.

1/2*3=1/2-1/3

Prin urmare

1-1/2+1/2-1/3+1/3+....+1/44-1/45=

Toti termenii mai putin primul si ultimul se taie intre ei si ramai cu:

1-1/45=44/45