Question

1-2+3-4+5-6+...+99-100 giúp mình nha

 

Answer 1

1-2+3-4+5-6+...+99-100

=(1-2)+(3-4)+(5-6)+...+(99-100)

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

= -50

Answer 2

       \(1-2+3-4+\)\(5-6+...+99-100\)

\(=\left(1-2\right)+\left(3-4\right)+\left(5-6\right)+...+\left(99-100\right)\)

\(=\left(-1\right)+\left(-1\right)+\left(-1\right)+...+\left(-1\right)\)

\(=\left(-1\right)\times50\)

\(=-50\)

        ~~~Hok tốt~~~

Answer 3

cảm ơn nha