Question

数学算式题

1000+999-998-997+996+995-994-993+...+104+103-102-101
=
=

Answer 1

(1000-104)/4+1=225

1000+999-998-997+996+995-994-993+...+104+103-102-101
=(1000+999-998-997)+(996+995-994-993)+...+(104+103-102-101)
= 4+4...+4
=4*225
=900

Answer 2

1000+999-998-997+996+995-994-993+...+104+103-102-101
=1000-998+999-997+996-994+995-993+...+104-102+103-101
=2+2+2+2+...+2+2（总共900/2个2）
= 450*2
= 900