1-2+3-4+5-6+…+2001-2002的值是 _ .

问题描述:

1-2+3-4+5-6+…+2001-2002的值是 ___ .

1-2+3-4+5-6+…+2001-2002,
=(-1)×,
=-1×1001,
=-1001;
故答案为:-1001.