Analysis: Determine the period of the function according to f(x+3)=f(x), and then determine the number of zeros of the function in a given interval by combining the parity of the function. Be careful to find all zeros and don't miss them.

Solution: From f(x+3)=f(x), it is concluded that 3 is the period of the function.

Since f(2)=0, if x ∈ (0 0,6),

It can be concluded that f(5)=f(2)=0,

And if f(x) is odd function, then f(-2)=-f(2)=0,

F(4)=f( 1)=f(-2)=0，

The function f(x) is the odd function defined on R, and it can be concluded that f(0)=0.

So f(3)=f(0)=0, when f(x+3)=f(x),

Let x=-3/2 and get f(-3/2)=f(3/2).

According to the fact that f(x) is a odd function defined on R, it is concluded that f(-3/2)=-f(3/2),

Let f(3/2)=-f(3/2), that is, f(3/2)=0,

So f(9/2)=f(3/2+3)=f(3/2)=0,

So f (9/2) = f (3/2) = f (4) = f (1) = f (3) = f (5) = f (2) = 0, if x ∈ (0 0,6).

So the answer is: 7.