時候可以這樣:
f(x)=(f(x-1)+f(x-2))/x
f(4)=(1/4+1/4)/4=1/8
按這個函數反推,f(0)=2f(2)-f(1)=0
時候可以這樣:
f(x)=(f(x-1)+f(x-2))/x
f(4)=(1/4+1/4)/4=1/8
按這個函數反推,f(0)=2f(2)-f(1)=0
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