问题
填空题
1-2+3-4+5-6+…+2001-2002的值是______.
答案
1-2+3-4+5-6+…+2001-2002,
=(-1)×(2002÷2),
=-1×1001,
=-1001;
故答案为:-1001.
1-2+3-4+5-6+…+2001-2002的值是______.
1-2+3-4+5-6+…+2001-2002,
=(-1)×(2002÷2),
=-1×1001,
=-1001;
故答案为:-1001.