1/42+1/56+1/72+1/90+1/110
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/30 02:44:52
![1/42+1/56+1/72+1/90+1/110](/uploads/image/z/6097529-65-9.jpg?t=1%2F42%2B1%2F56%2B1%2F72%2B1%2F90%2B1%2F110)
1/42+1/56+1/72+1/90+1/110
1/42+1/56+1/72+1/90+1/110
1/42+1/56+1/72+1/90+1/110
1/42+1/56+1/72+1/90+1/110
=(1/6-1/7)+(1/7-1/8)+(1/8-1/9)+(1/9-1/10)+(1/10-1/11)
=1/6-1/11
=11/66-6/66
=5/66
1/42+1/56+1/72+1/90+1/110
=(1/6-1/7)+(1/7-1/8)+(1/9-1/10)+(1/10-1/11)
=1/6-1/11
=11/66-6/66
=5/66
5/66