Question

(–1) + 2 + (–3) + 4 + … + (–99) + 100

 

Answer 1

\(\left(-1\right)+2+\left(-3\right)+4+...+\left(-99\right)+100\\ =\left(-1+2\right).100:2\\ =1.50\\ =50\)

Answer 2

 

(–1) + 2 + (–3) + 4 + … + (–99) + 100

= [(–1) + 2] + [(–3) + 4] + … + [(–99) + 100] có 50 số hạng 

=1+1+...+1 

=1.50

=50

 

 

Answer 3

(−1)+2+(−3)+4+...+(−99)+100

=(−1+2).100:2

=1.50

=50