5*2*1:(4-3)+2

Let's solve the expression step by step:

1. Start with the expression: \(5 \times 2 \times 1 : (4 - 3) + 2\)
2. Calculate the parentheses: \(4 - 3 = 1\)
3. Now replace it in the expression: \(5 \times 2 \times 1 : 1 + 2\)
4. Now we handle the multiplication and division from left to right:
   • \(5 \times 2 = 10\)
   • \(10 \times 1 = 10\)
   • \(10 : 1 = 10\)
5. Now we add the 2: \(10 + 2 = 12\)

So, the final answer is \(12\).