解答:
2222222222
解:原式=﹣[(2001﹣2000)+(1999﹣1998)+…+(6﹣5)+(4﹣3)+(2﹣1)]
=﹣[(2001+2000)×1+(1999+1998)×1+…+(6+5)×1+(4+3)+(2+1)×1]
=﹣(2001+2000+1999+1998+…+6+5+4+3+2+1)
=﹣2003001.
解答:
2222222222
解:原式=﹣[(2001﹣2000)+(1999﹣1998)+…+(6﹣5)+(4﹣3)+(2﹣1)]
=﹣[(2001+2000)×1+(1999+1998)×1+…+(6+5)×1+(4+3)+(2+1)×1]
=﹣(2001+2000+1999+1998+…+6+5+4+3+2+1)
=﹣2003001.