已知方程2x-4x+6x-8x+10x-12x +……-2000x =-y+3y-5y+……+1999y-2008,则x+y=
问题描述:
已知方程2x-4x+6x-8x+10x-12x +……-2000x =-y+3y-5y+……+1999y-2008,则x+y=
答
=2.008因为2x-4x+6x-8x+10x-12x+...-2000x=0y+3y-5y+...+1999y-2008
-1000x=1000y-2008
1000x+1000y=2008
x+y=2.008