6. 設 n 為正整數。若級數
【用戶】Liou
【年級】國二下
【評論內容】log相加等於真數相乘log2(2)+log2(3/2)+log2(4/3)+log2(5/4)+...+log2(n/n-1)+log2(n+1/n)=log2(2*3/2*4/3*5/4*...*n/n-1*n+1/n)=log2(n+1)=整數則n+1=2的次方數=1,2,4,8,16,32,64n=0,1,3,7,15,31,63