Question 78449
2.what is a fraction that is not a simple fraction?
(2/3)/(4/5) is a complex fraction because the numerator is a fraction.
The denominator in this case is also a fraction.
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3. a rational number 
A "rational number" is one that can be written as the "RATIO" of two
integers, such as 2/3  or 4/1 or 1/4.  The denominator must not be zero.
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Cheers,
Stan H.