283. 200:2*(540+460):10

Let's solve the expression step by step:

1. First, calculate the sum inside the parentheses: $$540 + 460 = 1000$$
2. Now, divide 200 by 2: $$200 : 2 = 100$$
3. Then, multiply the result by 1000: $$100 \cdot 1000 = 100000$$
4. Finally, divide by 10: $$100000 : 10 = 10000$$

So, the final answer is:

Answer: 10000