│1/12-1/11│+│1/13-1/12│+│1/14-1/13│+│1/15-1/14│

来源:学生作业学帮网 编辑:学帮网 时间:2024/06/07 07:03:42

│1/12-1/11│+│1/13-1/12│+│1/14-1/13│+│1/15-1/14│

│1/12-1/11│+│1/13-1/12│+│1/14-1/13│+│1/15-1/14│
=1/11-1/12+1/12-1/13+1/13-1/14+1/14-1/15
=1/11-1/15
=4/165

│1/12-1/11│+│1/13-1/12│+│1/14-1/13│+│1/15-1/14│
=1/11-1/12+1/12-1/13+1/13-1/14+1/14-1/15
=1/11-1/15
=4/165