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I don't understand this math problem: the teacher wrote 1 with a number. The second number is 1 1. The third number ...
Try it yourself. . .
The law is: the latter is the description of the former, the first is 1, and the second is 1 1, that is,11; The third describes the second, two 1, that is, 21; The fourth one is 1 2, 1 1, that is, 12 1 1. . Then push it slowly by yourself ...