Question

tính giùm e cái này 

S=1+2+3+.....+2002+2003+2004

Answer 1

\(S=\left(2004+1\right)\times\left(2004-1+1\right):2=2005\times2004:2=2009010\)

Answer 2

`S=(2004+1)x(2004-1+1):2=2005`

`2004:2=2009010`