The law is as follows.

1. Is the sum of the excircles11(3)14 (2)16 (1)? The sum of the fourth outer circle of 3 1 should be 17, which is called 5 and 7.

The fourth number should be 17-5-7=5. The law is the sum of the outer circles, and the difference between the last number and the previous number is reduced by 3 21.

2. Is the sum of four numbers 31(11) 42 (21)? The sum of the last four digits of (4 1) 104 should be 63, and 5 and 4 are known.

And the third number of 7 should be 63-5-4-7=48. The law is the sum of four numbers, and the difference between the last number and the previous number is112141.

The problem of primary school mathematics is too difficult, and the teacher who feels that it is a problem must be very powerful. Hmm. How interesting

Maybe it's wrong, maybe there are other ways, that's all I think. Hope to adopt. thank you