Yes, 1.425 is a rational number. A rational number is any number that can be expressed as a fraction where the numerator and denominator are both integers and the denominator is not zero. In this case, 1.425 can be expressed as the fraction 1425/1000, which can be simplified to 57/40, meeting the criteria for a rational 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.
Yes. Any rational number divided by another rational number is also rational.