Question

1+2-3-4+5+6-7-8+9+10-...+2013+2014-2015-2016

 

Answer 1

=1+(2-3-4+5)+(6-7-8+9)+...+(2010-2011-2012+2013)+(2014-2015-2016)

=1+0+0+...+0+(-2017)

=1+(-2017)

=-2016

 

Answer 2

A = -1 – 2 + 3 + 4 – 5 – 6 + 7 + 8 – 9 – 10 + 11 + 12 - ... – 2013 – 2014 + 2015 + 2016

 

A = (0 – 1 – 2 + 3) + (4 – 5 – 6 + 7) + ... + (2012- 2013 – 2014 + 2015) + 2016

 

A = 0 + 0 + ... + 0

 

A = 2016

 

Vậy A = 2016