You can't get an irrational number by applying a finite number of additions, subtractions, multiplications and divisions to a set of rational numbers.
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Yes. Any irrational number can be divided by itself to produce 1, which is a rational number.
It is not irrational because it can be expressed as one integer divided by another: -1/2.
100 divided by 5 multiplied by 4 minus 79 is 1.
-1 divided by 2 is a rational number because it can be expressed as a fraction in the form of -1/2
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