1+2+3+4+'''''''''''''''''''''''''''''''''''''''''''''''''''''+1999+2000-''''''''''''''''''''-x=?

来源：学生作业学帮网 编辑：学帮网 时间：2024/05/27 12:42:59

1+2+3+4+'''''''''''''''''''''''''''''''''''''''''''''''''''''+1999+2000-''''''''''''''''''''-x=?

=（1+2000）/2*2000-(1+2+3+.x)
=(1+2000)/2*2000-(1+x)/2*x
=.结果自己算.

1 2 3 4 1 2 3 4 1 2 3 4 1,2,3,4, 1 2 3 4 1 2 3 4 1,2,3,4, 1,2,3,4, 1,2,3,4, 1,2,3,4, 1 2 3 4 1,2,3,4, 1,2,3,4, 1,2,3,4, 1、2、3、4 1+2+3×4 1,2,3,4 1+2+3+4+.