1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110+1/132=

来源:学生作业学帮网 编辑:学帮网 时间:2024/06/06 00:47:15

1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110+1/132=

原式=1-1/2+1/2-1/3+1/3-1/4-1/4-1/5+1/5-1/6+.+1/11-1/12
=1-1/12
=11/12