81•9:3. 1000-243-112. 15:5•3

Here are the results (using left-to-right for same-precedence operations):

• 81 × 9 ÷ 3 = 243
• 1000 − 243 − 112 = 645
• 15 ÷ 5 × 3 = 9

Final answers: 243, 645, 9.