1000+999-998-997+996+…+104+103-102-101=(  ) A.225 B.900 C.1000 D.4000

问题描述:

1000+999-998-997+996+…+104+103-102-101=(  )
A. 225
B. 900
C. 1000
D. 4000

1000+999-998-997+996+…+104+103-102-101,
=(1000+999-998-997)+(996+995-994-993)+…+(104+103-102-101),
=4×225,
=900.
故选:B.