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There are 297 numbers in the page number of a math textbook. How many pages are there in this math textbook?
1-9 pages, 9 numbers

10-99,99-9 = 90 pages, with 180 numbers.

297- 180-9= 108

The 3-digit page number is 108/3=36 pages.

That is, there are 99+36= 135 pages in total.

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