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:作业帮 时间:2024/07/19 01:47:38
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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