Question

calculati :c)modul de -1 +modul de -2+modul de -3+..+modul de -120

Answer 1

$\displaystyle|-1|+|-2|+|-3|+...+|-120|= \\ =1+2+3+...+120= \frac{120(120+1)}{2} = \frac{120 \cdot 121}{2} = \frac{14520}{2} =7260$