Question

Calculati suma :

S=(96,34 + x ) + (86,34 + x) +...+ (16,34+ x) , unde x=3,66

Multumesc !

Answer 1

$96,34+x=96,34+3,66=100$
$86+x=90$
................................
$16,34+x=20$
Deci suma este
$100+90+80+\ldots+20=10(1+2+\ldots+10-1)=\\=10\left(\displaystyle \frac{11\cdot10}{2}-1\right)=10(55-1)=540$