5/9[ ]1/2 =1/18 2/5[ ]1/4=13/20 1/2[ ]1/5[ ]1/10=4/5 1/4[ ]1/6=1/12在括号里写恰当的运算符号5/9[ ]1/2 =1/18 2/5[ ]1/4=13/20 1/2[ ]1/5[ ]1/10=4/5 1/4[ ]1/6=1/12

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5/9[ ]1/2 =1/18 2/5[ ]1/4=13/20 1/2[ ]1/5[ ]1/10=4/5 1/4[ ]1/6=1/12在括号里写恰当的运算符号5/9[ ]1/2 =1/18        2/5[ ]1/4=13/20    1/2[ ]1/5[ ]1/10=4/5            1/4[ ]1/6=1/12
x)3շV57R57P07Ml 2`>DD(h暁=Y_

5/9[ ]1/2 =1/18 2/5[ ]1/4=13/20 1/2[ ]1/5[ ]1/10=4/5 1/4[ ]1/6=1/12在括号里写恰当的运算符号5/9[ ]1/2 =1/18 2/5[ ]1/4=13/20 1/2[ ]1/5[ ]1/10=4/5 1/4[ ]1/6=1/12
5/9[ ]1/2 =1/18 2/5[ ]1/4=13/20 1/2[ ]1/5[ ]1/10=4/5 1/4[ ]1/6=1/12
在括号里写恰当的运算符号
5/9[ ]1/2 =1/18 2/5[ ]1/4=13/20 1/2[ ]1/5[ ]1/10=4/5 1/4[ ]1/6=1/12

5/9[ ]1/2 =1/18 2/5[ ]1/4=13/20 1/2[ ]1/5[ ]1/10=4/5 1/4[ ]1/6=1/12在括号里写恰当的运算符号5/9[ ]1/2 =1/18 2/5[ ]1/4=13/20 1/2[ ]1/5[ ]1/10=4/5 1/4[ ]1/6=1/12
1.- 2.+ 3.+ + 4.-

满足1/a(n+1)-1/an=d(n∈N*,d为常数),则称数列{an}调和数列1+1/2+1/3+.+1/n≈lnn+C(C=0.57722.称作欧拉初始,专为调和级数