Oblicz. $\frac{2}{1*3}$ + $\frac{2}{3*5}$ + $\frac{2}{5*7}$ + ... + $\frac{2}{19*21}$ = $\frac{1}{1*3}$ + $\frac{1}{3*5}$ + $\frac{1}{5*7}$ + ... + $\frac{1}{99*101}$ = $\frac{1}{4*6}$ + $\frac{1}{6*8}$ + $\frac{1}{8*10}$ + ... + $\frac{1}{98*100}$ + $\frac{1}{100*102}$ =

Zadanie dodane przez Moni566 , 14.10.2012 11:11

Oblicz.
$\frac{2}{1*3}$ + $\frac{2}{3*5}$ + $\frac{2}{5*7}$ + ... + $\frac{2}{19*21}$ =

$\frac{1}{1*3}$ + $\frac{1}{3*5}$ + $\frac{1}{5*7}$ + ... + $\frac{1}{99*101}$ =

$\frac{1}{4*6}$ + $\frac{1}{6*8}$ + $\frac{1}{8*10}$ + ... + $\frac{1}{98*100}$ + $\frac{1}{100*102}$ =