3
$12 + 8 =$
$9 + 6 =$
$65 + 7 =$
$12 + 18 =$
$19 + 6 =$
$65 + 17 =$
$12 + 28 =$
$49 + 6 =$
$65 + 27 =$
$22 + 48 =$
$69 + 6 =$
$4 + 56 =$
$8 + 66 =$
$79 + 6 =$
$50 + 10 =$
$44 + 55 =$
$27 + 3 =$
$74 + 5 =$
$32 + 65 =$
$27 + 13 =$
$23 + 26 =$
$40 + 37 =$
$27 + 23 =$
$40 + 60 =$
$42 + 50 =$
$43 + 27 =$
$32 + 7 =$
$79 + 7 =$
$74 + 6 =$
$74 + 5 =$
$40 + 52 =$
$32 + 18 =$
$42 + 18 =$
$25 + 9 =$
$53 + 30 =$
$10 + 55 =$
$50 + 50 =$
$63 + 25 =$
$62 + 27 =$
将相邻两数之和大于 20 的两个数圈起来。（可以左右圈，也可以上下圈）

答案略