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# Help! Pre algebra question? :L?

I have no idea on how to do this. Some of the questions I have are:

1. a^7/a^10

2. 4x^2y/2x^3

3. x^3y^4/x^9y^2

If I could just get a step by step explanation on how to rewrite these without the fraction bar, it'd be a lot of help. (:

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