Solving the problem of compulsory five-sequence in senior high school mathematics - Training Enrollment Network

Solving the problem of compulsory five-sequence in senior high school mathematics

Answer:

Write 999999999 first. There are n 9s in the nth item.

The general formula is an = 10 n- 1.

∴ 8, 88, 888, 8888 A general formula with the nth term n 8 is an = (8/9) * (10 N- 1).

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