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There are 400 picture books in the library, less than story books. How many story books are there?
There are 500 copies. Take the number of story books as the unit "1", draw 400 books, which is the story book (1-5). How many story books are needed is to find the unit "1" and solve it by division. 400 divided by 0- 1 = 400 in 65438+5 divided by 4 = 500 in 5.
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