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
答
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.