Question

a)1+2-4+6-8+10-12+...2010-2012+2013 = ?

Answer 1

a, 1+2-4+6-8+10-12+...+2010-2012+2013

=1+(4-2)+(6-8)+(12-10)+...+(2012-2010)+2013

=1+2+2+2+...+2+2013 ( 503 số 2 )

=1+503x2+2013

=2014+1006

=3020

Answer 2

  1+2-4+6-8+10-12+...2010-2012+2013

= ( 1 + 2013 ) +  ( 2 - 4 ) + ( 6 - 8 ) + ( 10 - 12 ) + ....... + ( 2010 - 2012 ) 

= 2004 + (-2) + (-2) + (-2) + (-2) +........ + (-2)

                    ( có 503 số - 2 ) 

=    2004 + (-2) . 503 

=   2004 + (-1006)

=      998