Question

Tính tổng : 

1 + 2 + 3 + 4 .... + 1997 + 1998 + 1999 + 2000

Answer 1

1 + 2 + 3 + 4 .... + 1997 + 1998 + 1999 + 2000

= (2000+1) x 2000 : 2

= 2001 x 2000 : 2

= 4002000 : 2 

= 2001000

Answer 2

co so so hang la

          (2000-1)/1+1=2000so

tong la

          (2000+1)*2000/2=2001000

Answer 3

(2000+1)x(2000-1+1):2=2001000

Answer 4

1 + 2 + 3 + 4 .... + 1997 + 1998 + 1999 + 2000

= (2000+1) x 2000 : 2

= 2001 x 2000 : 2

= 4002000 : 2 

= 2001000