1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110+1/132=
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/01 09:04:59
![1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110+1/132=](/uploads/image/z/18464-32-4.jpg?t=1%2F2%2B1%2F6%2B1%2F12%2B1%2F20%2B1%2F30%2B1%2F42%2B1%2F56%2B1%2F72%2B1%2F90%2B1%2F110%2B1%2F132%3D)
x)3767bC H$abY
MR>zl(i{m
u!icv mŦ CtAkEayv ;
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110+1/132=
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110+1/132=
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