45+6*9-90 20-2*8+66 51-8*5-11 81:7*9 32:4*6 49:7*8 9*8+8 7*3+7 6*9+6

Let's calculate each expression step-by-step. 1. **45 + 6 * 9 - 90** - First, calculate \(6 * 9 = 54\) - Then, \(45 + 54 - 90 = 99 - 90 = 9\) 2. **20 - 2 * 8 + 66** - First, calculate \(2 * 8 = 16\) - Then, \(20 - 16 + 66 = 4 + 66 = 70\) 3. **51 - 8 * 5 - 11** - First, calculate \(8 * 5 = 40\) - Then, \(51 - 40 - 11 = 11 - 11 = 0\) 4. **81 ÷ 7 * 9** - First, calculate \(81 ÷ 7 ≈ 11.57\) (but keep the exact fraction for accuracy) - Then, \(11.57 * 9 ≈ 104.14\) (exact calculation: \((81/7) * 9 = \frac{729}{7} = 104.14\)) 5. **32 ÷ 4 * 6** - First, calculate \(32 ÷ 4 = 8\) - Then, \(8 * 6 = 48\) 6. **49 ÷ 7 * 8** - First, calculate \(49 ÷ 7 = 7\) - Then, \(7 * 8 = 56\) 7. **9 * 8 + 8** - First, calculate \(9 * 8 = 72\) - Then, \(72 + 8 = 80\) 8. **7 * 3 + 7** - First, calculate \(7 * 3 = 21\) - Then, \(21 + 7 = 28\) 9. **6 * 9 + 6** - First, calculate \(6 * 9 = 54\) - Then, \(54 + 6 = 60\) ### Summary of Solutions: 1. \(9\) 2. \(70\) 3. \(0\) 4. \(~104.14\) (or \( \frac{729}{7} \)) 5. \(48\) 6. \(56\) 7. \(80\) 8. \(28\) 9. \(60\)