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