Question

1/ Calculați a-(b-c), unde:
a) =1+2+3+...+2013
b=108+109+110+...+149
c=13+14+15+...+42​

Answer 1

$a-(b-c)$

Aflăm toate rezultatele sumelor...

Prin formula lui Gauss desigur...

$A= 2013=2013*(2013+1):2$

$A= 2013=(2013*2014):2$

$a= 4.054.182:2$

$a=2.027091$

$b= 149=(149*(149+1):2$

$b= s149=(149*150):2$

$b= 22.350:2$

$b=11175$

$c= 42=(42*(42+1)):2$

$c= 42=(42*43):2$

$c=42=1806:2$

$c=903$

$2.027091-(11175-903)$

$2027091-10272 = 2016819$

Sper că te-am ajutat!

Succes!