tolong jawab dengan caranya

2. 18 + 23 = 41
3. 26 - 16 = 10
4. 35 - 27 = 8
5. 19 × 21 = 399
6. 31 × 20 = 620
7. 11 × 17 = 187
8. 17 √ 7 ÷ √ 144
=>> 17 √ 7 ÷ 12
=>> 1 √ 5 ÷ √ 7
9. 45 ÷ 15 = 3
10. 26 ÷ 13 = 2