f(n)=1/2+1/3+1/4 ...+1/(2^n-1) ,则f(k+1)-f(k)=

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f(n)=1/2+1/3+1/4...+1/(2^n-1),则f(k+1)-f(k)=f(n)=1/2+1/3+1/4...+1/(2^n-1),则f(k+1)-f(k)=f(n)=1/2+1/3+1

f(n)=1/2+1/3+1/4 ...+1/(2^n-1) ,则f(k+1)-f(k)=
f(n)=1/2+1/3+1/4 ...+1/(2^n-1) ,则f(k+1)-f(k)=

f(n)=1/2+1/3+1/4 ...+1/(2^n-1) ,则f(k+1)-f(k)=
f(k+1)有2^(k+1)-2项,f(k)有2^k-2项
因此f(k+1)-f(k)有[2^(k+1)-2]-[2^k-2]=2^k项,即
f(k+1)-f(k)=1/2^k+1/(2^k+1)+.+1/(2^(k+1)-2)+1/(2^(k+1)-1)

还要什么过程啊,f(k+1)就比f(k)多了一项吗,
答案就是那一项咯1/[2^(k+1)-1]