if a, b, c, d, e, and f are all integers prove that r is rational

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- Mar 2nd 2010, 05:52 PMMathwizard4Is this rational and why?
if a, b, c, d, e, and f are all integers prove that r is rational

- Mar 2nd 2010, 05:58 PMDrexel28
- Mar 2nd 2010, 06:08 PMMathwizard4
- Mar 3rd 2010, 03:42 AMemakarov
First, you need to make sure that you never divide by 0.

Second, all integers are rational, and rational numbers are closed under addition, subtraction, multiplication and division by a non-zero (i.e., the result of the operation is again rational).