Substitute the variable in the denominator for a value that will make the denominator have a value of 0 or an imaginary number
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It must be a generalised rational number. Otherwise, if you select a rational number to multiply, then you will only prove it for that number.
It can be written in the form of the ratio 55555/100000.
Any, and every, irrational number will do.
zero is rational because it can be written as a fraction where the denominator is not equal to 0. it can be written as 0/1, 0/2, 0/3, etc
6.52 is a rational number because it can be expressed as a fraction in the form of 163/25 whereas irrational numbers can't be expressed as fractions.