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Another rational expression.
Yes.
Any number that can be expressed as a fraction is a rational number otherwise it is an irrational number.
The expression written in the question is the rational expression.
Basically, a rational expression would include only additions, subtractions, multiplications, divisions, and integer powers, while an irrational expression could, in addition, include several additional functions, such as roots (or equivalently, non-integer powers), exponential functions, logarithms, trigonometric functions, and just about any other function.