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第一題:選D.因為X(n)=a^n,0……>X(n)第二題:選B.因為f(x)+f(y)=f(x+y)-xy-1且f(1)=1,現取x=1,y=n-1,則有1+f(n-1)=f(n)-(n-1)-1=f(n)-n整理得f(n)-f(n-1)=n+1解此遞推方程得f(n)=0.5n^2+1.5n-1若f(n)=n,則有0.5n^2+…
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