为简便计,将log已a为底b的对数记为log(a,b),则原题即：若[log (1/2,x)]^2-6log(1/2,x)+8≤0,求f(x)=9[log(4,x)]^2-[log(2,x)]^2的平方的最大值与最小值.[log (1/2,x)]^2-6log(1/2,x)+8=[log (2,x)]^2+6log(2,x)+8=[l...