Question

Calculati:
a) 1 supra 17+2 supra 17+3 supra 17+...+ 39 supra 17.
Va rog sa ma ajutati...

Answer 1

$\frac{1}{17} + \frac{2}{17}+ \frac{3}{17} +...+\frac{39}{17} = \frac{1+2+3+...+39}{17}= \frac{39*40:2}{17}= \frac{39*20}{17}= \frac{780}{17}$