Question

1-1/1+2-2/3+3-3/4+4-1/4-3-1/3-2-1/2-1

Answer 1

1 - 1/1 + 2 - 2/3 + 3 - 3/4 + 4 - 1/4 - 3 -1/3 - 2 - 1/2 - 1 ( có 11 số, 11 : 2 dư 1)

= ( 1 - 1) - ( 1/1 + 1/2) + ( 2 - 2) - ( 2/3 + 1/3) + ( 3 - 3) - ( 3/4 + 1/4) + 4

= 0 - 3/2 + 0 - 1 + 0 - 1 + 4

= -7/2 + 8/2

= 1/2

Answer 2

Bài này = \(\frac{1}{2}\)