1+1/2+1/6+1/12+1/20+1/30+1/42+1/56+.1/132=快
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/31 16:58:50
![1+1/2+1/6+1/12+1/20+1/30+1/42+1/56+.1/132=快](/uploads/image/z/18435-3-5.jpg?t=1%2B1%2F2%2B1%2F6%2B1%2F12%2B1%2F20%2B1%2F30%2B1%2F42%2B1%2F56%2B.1%2F132%3D%E5%BF%AB)
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1+1/2+1/6+1/12+1/20+1/30+1/42+1/56+.1/132=快
1+1/2+1/6+1/12+1/20+1/30+1/42+1/56+.1/132=
快
1+1/2+1/6+1/12+1/20+1/30+1/42+1/56+.1/132=快
1+1/2+1/6+1/12+.+1/132
=1+(1-1/2)+(1/2-1/3)+(1/3-1/4)+.+(1/11-1/12)
=1+1-1/2+1/2-1/3+1/3-1/4+.+1/11-1/12
=2-1/12
=1又11/12