正文

1. 5 + 7 × 3 - 2 ÷ 1 2. 12 ÷ 4 × 2 + 3 3. 8 - 6 ÷ 2 × 3 4. 4 × 5 + 2 ÷ 1 - 3 5. 9 × 6 - 3 + 2 ÷ 1 6. 15 ÷ 3 × 2 - 5 7. 10 + 4 × 5 - 8 ÷ 2 8. 7 × 2 + 3 - 4 ÷ 1 9. 6 ÷ 2 × 3 + 5 - 1 10. 9 + 6