Question

1 tính tổng

(-20+3+(-4)+5+...+(-2014)+2015+(-2016)+2017+(-2018)

 

Answer 1

(-2)+3+(-4)+5+....+(-2016)+2017+(-2018)

= 1+1+1+....+1+(-2018)

= 1 x 2016 + (-2018)

= 2016 + (-2018)

=   -2

Answer 2

(-20+3+(-4)+5+...+(-2014)+2015+(-2016)+2017+(-2018)

= 1 x 2016 + (-2018)

= 2016 - 2018

= -2