貳、多重選擇題:31.已知a>1且f(x) = ax、g(x) = logax,則下列哪些選項是正確的?(A)若 g(3) = 2,則 f(2) = 3(B)若f(3) = 2,則 g(4) = 9(C)y=f(x)與y = g(x)的圖形對稱於x+y= 0的直線(D)