有理数（Rational Number）是可以表示为两个整数之比的数。具体来说，一个有理数可以表示为
a
b
b
a
，其中
a
a 和
b
b 是整数，且
b
≠
0
b
?
=0。有理数包括整数（如 -3, 0, 4）以及分数（如
1
2
2
1
,
–
3
4
–
4
3
）。小数如果是有限小数或无限循环小数，也属于有理数（例如，0.75 和 0.333...）。
有理数的集合通常用符号
Q
Q 表示。
A rational number is any number that can be expressed as the quotient or fraction
a
b
b
a
of two integers, where
a
a (the numerator) and
b
b (the denominator) are integers, and
b
≠
0
b
?
=0. In simpler terms, rational numbers are numbers that can be written as a fraction.
Rational numbers include:
Integers (e.g., -3, 0, 4)
Fractions (e.g.,
1
2
2
1
,
–
3
4
–
4
3
)
Terminating decimals (e.g., 0.75)
Repeating decimals (e.g., 0.333...)
The set of all rational numbers is usually denoted by the symbol
Q
Q.
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