12*0:4 0*9:3 16:2:1

It looks like you're presenting various mathematical expressions. Let's simplify each of them:

1. 12 * 0 : 4

   • This expression can be computed as follows:
   • First, compute \(12 * 0 = 0\).
   • Then, \(0 : 4 = 0\).

   So, the result of this expression is 0.

2. 0 * 9 : 3

   • Compute \(0 * 9 = 0\).
   • Then, \(0 : 3 = 0\).

   Thus, the result of this expression is also 0.

3. 16 : 2 : 1

   • This expression can be interpreted as \( (16 : 2) : 1 \).
   • First, compute \(16 : 2 = 8\).
   • Next, compute \(8 : 1 = 8\).

   Hence, the result of this expression is 8.

In summary:

1. Result of \(12 * 0 : 4 = 0\)
2. Result of \(0 * 9 : 3 = 0\)
3. Result of \(16 : 2 : 1 = 8\)