作业帮1/2+1/6+1/12+1/20+1/30+1/42+……+1/110=?急用!
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1/2+1/6+1/12+1/20+1/30+1/42+……+1/110=?急用!
1/2+1/6+1/12+1/20+1/30+1/42+……+1/110=?
急用!
1/2+1/6+1/12+1/20+1/30+1/42+……+1/110=?急用!
1/2+1/6+1/12+1/20+1/30+1/42+……+1/110
=1-1/2+1/2-1/3+1/3-1/4+……+1/10-1/11
=1-1/11
=10/11
1/2+1/6+1/12+1/20+1/30+1/42+……+1/110
=1- 1/2 +1/2-1/3+1/3 - 1/4…...+1/10-1/11
=1-1/11
=10/11
1/2+1/6+1/12...+1/110
=1-1/2+1/2-1/3+1/3-1/4...+1/10-1/11
=1-1/11
=10/11
10/11
只要答案的话用计算机算下！！会编程吗！！