Because a rational number is DEFINED as a number which can be expressed in that form!
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Any number that can be expressed as a fraction is a rational number
Any number that can be expressed as a fraction is a rational number as for example the integer 3 is 3/1 as an imprope fraction
130 is a rational number. A "rational" number is any number than can be expressed as a fraction or "ratio". 130 is a rational number because it can be expressed as a fraction, such as 130/1.
Any number or decimal number that can be expressed as fraction is rational.
Yes because any number that can be expressed as a fraction is a rational number.