f(n)=1/n+1 + 1/n+2 + 1/n+3 +……+1/3n,则f(k+1)-f(k)=
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f(n)=1/n+1+1/n+2+1/n+3+……+1/3n,则f(k+1)-f(k)=f(n)=1/n+1+1/n+2+1/n+3+……+1/3n,则f(k+1)-f(k)=f(n)=1/n+1+1
f(n)=1/n+1 + 1/n+2 + 1/n+3 +……+1/3n,则f(k+1)-f(k)=
f(n)=1/n+1 + 1/n+2 + 1/n+3 +……+1/3n,则f(k+1)-f(k)=
f(n)=1/n+1 + 1/n+2 + 1/n+3 +……+1/3n,则f(k+1)-f(k)=
f(k+1)-f(k)=1/(3k+1) + 1/(3k+2)+ 1/(3k+3)- 1/(k+1)=1/(3k+1) + 1/(3k+2)- 2/(3k+3)>0
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f(n)=1/(n+1)+1/(n+2)+1/(n+3)……+1/2n (n∈N*),f(n+1f(n)=1/(n+1)+1/(n+2)+1/(n+3)……+1/2n (n∈N*),f(n+1)-f(n)=?
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