3\51+4\51+6\51+...+58\51-1\51-3\51-5\51-...49\51
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/27 02:32:13
![3\51+4\51+6\51+...+58\51-1\51-3\51-5\51-...49\51](/uploads/image/z/3701462-14-2.jpg?t=3%5C51%2B4%5C51%2B6%5C51%2B...%2B58%5C51-1%5C51-3%5C51-5%5C51-...49%5C51)
3\51+4\51+6\51+...+58\51-1\51-3\51-5\51-...49\51
3\51+4\51+6\51+...+58\51-1\51-3\51-5\51-...49\51
3\51+4\51+6\51+...+58\51-1\51-3\51-5\51-...49\51
3\51+4\51+6\51+...+58\51-1\51-3\51-5\51-...49\51中第一个3应当是2.
58应当是50 即
2\51+4\51+6\51+...+50\51-1\51-3\51-5\51-...49\51
=(2/51-1/51)+(4/51-3/51)--+(50/51-49/51)
=1/51+1/51----+1/51(共25个)
=25/51-