Question

100- 99 + 98- 97 + ... + 4 - 3 +2 -1 =            

Answer 1

100- 99 + 98- 97 + ... + 4 - 3 +2 -1

=(100- 99) + (98- 97) + ... + (4 - 3) +(2 -1)

=1+1+...+1+1

=1.50

=50

Answer 2

50 nha bạn

Answer 3

100 - 99 + 98 - 97 + ... + 4 - 3 + 2 - 1

= ( 100 - 99 ) + ( 98 - 97 ) + ... +  ( 4 - 3 ) + ( 2 - 1 )

= 1 + 1 + ... + 1 + 1

= 1 . ( 100 : 2 )

= 1 . 50

= 50