Question

Tính tổng: S= (- 1) + (- 1) ^ 2 + (- 1) ^ 3 +...+(-1)^ 2014 +(-1)^ 2015

Answer 1

\(S=-2\)

Answer 2

\(\cdot DuyNam\)

\(S=\left(-1\right)+\left(-1\right)^2+\left(-1\right)^3+...+\left(-1\right)^{2014}+\left(-1\right)^{2015}\)

\(S=\left(-1\right)+1+\left(-1\right)+...+1+\left(-1\right)\) (2015 thừa số)

`-> S= (-1)`