>
数学
>
设
f(n)=1+
1
2
+
1
3
+
1
4
+…+
1
2
n
,则f(k+1)-f(k)= ___ .
人气:327 ℃ 时间:2020-02-04 11:10:33
解答
当n=k+1时,f(k+1)=1+12+13+14+…+12k+1,当n=k时,f(k)=1+12+13+14+…+12 k,则f(k+1)-f(k)=1+12+13+14+…12 k+12 k+1+…+12k+1-(1+12+13+14+…+12 k)=12k+1+12k+2+…+12k+1,故答案为:...
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