Matematika A - 2011. ljeto, 9.

$\frac{t(t+1)}{2}\backslash frac\{t(t+1)\}\{2\}$

$\frac{t(t-1)}{2}\backslash frac\{t(t-1)\}\{2\}$

$\frac{2}{t(t+1)}\backslash frac\{2\}\{t(t+1)\}$

$\frac{2}{t(t-1)}\backslash frac\{2\}\{t(t-1)\}$