1995+1996+1997+1998+1999-2000.

问题描述:

1995+1996+1997+1998+1999-2000.

1995+1996+1997+1998+1999-2000,
=(2000-5)+(2000-4)+(2000-3)+(2000-2)+(2000-1)-2000,
=2000×4-(5+4+3+2+1),
=8000-15,
=7985.