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What are the classic problems of finding laws in seventh grade mathematics?
The classic problems of finding laws in seventh grade mathematics are as follows:

1. 1, 4, 5, 8, 9, (), ().

2.20, 18, 16, 14, 12, (), (), ().

Three, two, five, eight, 1 1, (), ().

Four. 1, 13, 2, 14, 3, 15, 4, 16, (), (), (), ().

Verb (abbreviation of verb)1,2, 4, 7,11,(), ().

6. 1, 2, 4, 7, 1, 16, (22), (29)-the difference is:1,2, 3, 4, 5, 6.

Seven, two, five, 10, 17, 26, (37), (50)-the difference is: 3, 5, 7, 9.

Eight, 0, 3, 8, 15, 24, (35), (48)-the difference is: 3, 5, 7, 9.