计算:1000+999-998-997+996+995-994-993+...+108+107-106-105+104+103-102-101

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/07 20:05:32
计算:1000+999-998-997+996+995-994-993+...+108+107-106-105+104+103-102-101

计算:1000+999-998-997+996+995-994-993+...+108+107-106-105+104+103-102-101
计算:1000+999-998-997+996+995-994-993+...+108+107-106-105+104+103-102-101

计算:1000+999-998-997+996+995-994-993+...+108+107-106-105+104+103-102-101
=1000+(999-998-997+996)+(995-994-993+992)+...(103-102-101+100)-100
=1000+0+0+...+0-100
=1000-100
=900

=(1000+999-998-997)+(996+995-994+993)+...+(108+107-106-105)+(104+103-102-101)
=4+4+...+4+4
=225X4
=900