Question

Tính : 1+2-3-4+5+6-7-8+9+10-11-12+......+2006-2007-2008+2009

Answer 1

= 1 + (2- 3 - 4 + 5) + (6 - 7 - 8 + 9) + (10 - 11 - 12 + 13) + ...+ (2006 - 2007 - 2008 + 2009)

= 1 + 0 + 0 + 0 + ...+ 0 = 1

Answer 2

bằng 1

Answer 3

Trả lời :

Bằng 1 

Hok tốt!