1/2+1/6+1/12+...+1/72简便运算

来源:学生作业学帮网 编辑:学帮网 时间:2024/04/27 10:10:34

1/2+1/6+1/12+...+1/72简便运算

原式=(1-1/2)+(1/2-1/3)+(1/3-1/4)+.+(1/8-1/9)
=1-1/9=8/9

1/2+1/6+1/12+...+1/72
=1-1/2+1/2-1/3+1/3-1/4+...+1/8-1/9
=1-1/9
=8/9

原式=(1-1/2)+(1/2-1/3)+(1/3-1/4)+....+(1/8-1/9)
=1-1/9=8/9
1/2+1/6+1/12+...+1/72
=1-1/2+1/2-1/3+1/3-1/4+...+1/8-1/9
=1-1/9
=8/9

8/9