fenshi

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/17 13:43:51

fenshi
fenshi

fenshi
1/[x(x+1)]+1/[(x+1)(x+1)]-1/[(x+2)(x+1)]-1/[(x+3)(x+1)]=1/(x+1)[1/x+1/(x+1)-1/(x+2)-1/(x+3)]=4/[x(x+1)(x+3)]