Question

A= 1+ 2- 3- 4+ 5+ 6- 7- 8+ 9+ ... -2012+ 2013+ 2014

Answer 1

A=1+2-3-4+5+6-7-8+9+...-2012+2013+2014

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

A=1+0+0+...+0+2014

A=2015

Answer 2

1 + 2 - 3 - 4 + 5 + 6 - 7 - 8 + 9 + ... - 2012 + 2013 + 2014 ( có 2014 số, 2014 chia 4 dư 2)

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

= 1 + 0 + 0 + ... + 0 + 2014

= 2015 + 0 = 2015

Answer 3

A = 1 + 2 - 3 - 4 + 5 + 6 - 7 - 8 + 9 + ... - 2012 + 2013 + 2014  

   = 1 + 2014 + (2 - 3 - 4 + 5) + (6 - 7 - 8 + 9) + ... + (2010 - 2011 - 2012 + 2013) = 2015 + 0 + 0 + ... + 0 = 2015

Answer 4

A=1+2-3-4+5+6-7-8+9+...-2012+2013+2014

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

A=1+0+0+...+0+2014

A=2015

Answer 5

A = 1 + 2 - 3 - 4 + 5 + 6 - 7 - 8 + 9 +...-2012 + 2013 +2014

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

A = 1+0+0+...+0+2014 = 2015