Question

Tính tổng: 2-4+6-8+.....+48-50

Answer 1

=-100 nha bạn

Answer 2

        \(2-4+6-8+...+48-50\)

\(=\left(2-4\right)+\left(6-8\right)+...+\left(48-50\right)\)

\(=\left(-2\right)+\left(-2\right)+...+\left(-2\right)\)          

\(=\left(-2\right).50:2\)

\(=-50\)

Answer 3

2 - 4 + 6 - 8 + ..... + 48 - 50

= (2 - 4) + (6 - 8) + ..... + (48 - 50)

= - 2 + ( - 2 ) + .... + ( - 2 ) ( có 25 số - 2 )

= - 2. 25

= - 50