题目内容：

f(3x)=log2根号下9x+5/2 则f(1)等于

优质解答

f(3x) = log2 根号[(9x+5)/2] = log2 根号{3*(3x) + 5]/2}
f(x) = log2 根号[(3x+5)/2]
f(1) = log2 根号[(3*1+5)/2] = log2 根号4 = log2 (2) = 1