Question

-1-2-3-4-5-6-7-8-9-......-2018=?

ai nhanh thì tk nha

Answer 1

\(-\left(1+2+3+...+2018\right)\)

\(1+2+3+...+2018=\left[\left(2018-1:1+1\right).\left(2018+1\right):2\right]\)

\(=\frac{2018.2019}{2}=1009.2019\)

\(=>-\left(1+2+...+2018\right)=-\left(1009.2019\right)\)

bằng bao nhiêu bn tự tính nha

Answer 2

= -2037171

Answer 3

-1-2-3-...-2018

= - (1+2+...+2018)

= - (1+2018).2018:2

= -2 037 171