Условие:
1. 62+8
2. 83+7
3. 68+5
4. 36+9
5. 19+17
6. 50-7
7. 60-6
8. 60-14
9. 30-18
10. 70-13
11. 200-6
12. 500-8
13. 12-4
14. 13-5
15. 16-9
16. 15-7
17. 35-6
18. 61-8
19. 31-16
20. 52-27
Решение:
\[\boxed{\mathbf{1.}}\]
\[62 + 8 = 70\]
\[\boxed{\mathbf{2.}}\]
\[83 + 7 = 90\]
\[\boxed{\mathbf{3.}}\]
\[68 + 5 = 73\]
\[\boxed{\mathbf{4.}}\]
\[36 + 9 = 45\]
\[\boxed{\mathbf{5.}}\]
\[19 + 17 = 36\]
\[\boxed{\mathbf{6.}}\]
\[50 - 7 = 43\]
\[\boxed{\mathbf{7.}}\]
\[60 - 6 = 54\]
\[\boxed{\mathbf{8.}}\]
\[60 - 14 = 46\]
\[\boxed{\mathbf{9.}}\]
\[30 - 18 = 12\]
\[\boxed{\mathbf{10.}}\]
\[70 - 13 = 57\]
\[\boxed{\mathbf{11.}}\]
\[200 - 6 = 194\]
\[\boxed{\mathbf{12.}}\]
\[500 - 8 = 492\]
\[\boxed{\mathbf{13.}}\]
\[12 - 4 = 8\]
\[\boxed{\mathbf{14.}}\]
\[13 - 5 = 8\]
\[\boxed{\mathbf{15.}}\]
\[16 - 9 = 7\]
\[\boxed{\mathbf{16.}}\]
\[15 - 7 = 8\]
\[\boxed{\mathbf{17.}}\]
\[35 - 6 = 29\]
\[\boxed{\mathbf{18.}}\]
\[61 - 8 = 53\]
\[\boxed{\mathbf{19.}}\]
\[31 - 16 = 15\]
\[\boxed{\mathbf{20.}}\]
\[52 - 27 = 25\]