Question

2-4-6+8+10-12-...+1994-1996-1998+2000

Answer 1

  (2-4-6+8)+(10-12-14+16)+...+(1994-1996-1998+2000)

= (2+8-4-6)+(10+16-12-14)+...+(1994+2000-1996-1998)

= 0+0+....+0

= 0

 

Answer 2

-2000 nha bạn

Answer 3

Đặt: A=2-4-6+8+10-12-...+1994-1996-1998+2000

Ta có: A=2-4-6+8+10-12-...+1994-1996-1998+2000

 =>     A= (2 – 4 – 6 + 8) + (10- 12 – 14 + 16) + … + (1994 – 1996 – 1998 + 2000)

 =>     A = 0 + 0 + … + 0

 =>     A = 0

Vậy 2-4-6+8+10-12-...+1994-1996-1998+2000=0