8888+9999+7777+6666
=8888+9999+7777+1+1112+2223+3330
=10000×3+3330
=33330
1+2-3-4+5+6-7-8+9+10-………………+2006
=1+(2-3)+(-4+5)+(6-7)+(-8+9)……+(-2004+2005)+2006
=1-1+1-1+1………-1+2006
=2006
8888+9999+7777+6666
=8888+9999+7777+1+1112+2223+3330
=10000×3+3330
=33330
1+2-3-4+5+6-7-8+9+10-………………+2006
=1+(2-3)+(-4+5)+(6-7)+(-8+9)……+(-2004+2005)+2006
=1-1+1-1+1………-1+2006
=2006