1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72=?
来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/23 09:13:00
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72=?1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72=?1/2+1/6+1/12+1/20+1/30
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72=?
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72=?
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72=?
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72
=1-1/2+1/2-1/3+……+1/8-1/9
=1-1/9
=8/9
1-1/9=8/9
按一下计算器8/9
原式=1/1*2+1/2*3+1/3*4+……+1/8*9
=1-1/2+1/2-1/3+1/3-1/4+……+1/8-1/9
=1-1/9
=8/9