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Question: How to convert a string into a number?

Question:How to convert a string into a number?

Glowing 95 Maple 2015
matrix string import
September 19 2015
3

I have calculated a matrix in rational numbers and export the result into a .CSV file, but when I import it back into the Maple, all the rational numbers have turned into strings and can’t be handled mathematically any more.

How to turn them back into rational numbers?
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