The standard form is p/q where p and q are integers and q > 0.
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The real numbers.
0.7 IS is a rational number. It is in the form of a terminating decimal.
Yes. Integers are just rational numbers of the form a/1.
Always true. (Never forget that whole numbers are rational numbers too - use a denominator of 1 yielding an improper fraction of the form of all rational numbers namely a/b.)
Rational numbers are numbers which can be expressed as a ratio of two integers, p and q (where q >0), in the form p/q.