Question

AJUTOR!!!!
Calculati (1+2+..+10.434):10.435

Answer 1

(1+2+...+10435):10435=
=(1+10435)*1045:2:1045=
=(1+10435):2*1045:1045=
=1046:2=
=523

Answer 2

$\displaystyle (1+2+3+...+10434):10435= \frac{10434(10434+1)}{2} :10435= \\ \\ = \frac{10434\times 10435}{2} :10435= \frac{108878790}{2} :10435= \\ \\ =54439395:10435=5217$