Question

Tính tổng:

S= (-1) + 2 + (-3) +...+ (-99) + 100

Answer 1

S=(-1+2)+(-3+4)+...+(-99+100)

=1+1+...+1

=50

Answer 2

S = (-1) + 2 + (-3) +...+ (-99) + 100

S = 1 + 1 +...+1

S = 1 . 50

S = 50

Answer 3

https://i.imgur.com/NRUbQsY.jpg