It is known that the definition field of function FX is (0, positive infinity) and FX is an increasing function on the definition field, f (XY) = f (x) + F (y), and f (2) = 1, If f (3) = 1 and f (a) is greater than f (A-1) + 2, the value range of a is obtained

It is known that the definition field of function FX is (0, positive infinity) and FX is an increasing function on the definition field, f (XY) = f (x) + F (y), and f (2) = 1, If f (3) = 1 and f (a) is greater than f (A-1) + 2, the value range of a is obtained

Through two known conditions, we know that f (6) = 2, so f (a) & gt; f (A-1) + F (6) = f (6a-6). Because it is an increasing function, we can solve the inequality a & gt; 6a-6, so the answer is a & lt; 6 / 5