-- Excuse me, how can I get to the post office?
-- .
A:Never mind
B:Sorry, I am new here
C:That's OK
①对任意正数a,b,都有f(a)+f(b)=f(ab);
②当x>1时,f(x)<0;
③f(2)=﹣1
(I)求f(1)和 f(14) 的值;
(II)试用单调性定义证明:函数f(x)在(0,+∞)上是减函数;
(III)求满足f(log4x)>2的x的取值集合.
- Do you think our basketball team will win the match?
- Yes, we have better players. So I them to win.