呵 2年以上以前 (0.25)^2=(1/4)^2=2^(-4) 2^(4)+2^(-4)+2 = [2^(2)]^2 +[2^(-2)]^2 +2×[2^(2)]×[2^(-2)] =[2^(2)+2^(-2)]^2 開根號之後:4+1/4 = 17/4 留言