Phrase
rational number
noun
有理数
A number that can be expressed as the quotient of two integers, where the denominator is not zero.
- 1.
A number that can be expressed as the ratio of two integers.
可以表示为两个整数之比的数。
可以表示为两个整数之比的数。；[经] 有理数
In use
Every rational number can be written as a fraction of two integers.
The students compared rational numbers and irrational numbers in today's math class.
A rational number has a decimal expansion that either ends or repeats.
be a rational number
π is not a rational number.
π不是有理数。
express as a rational number
Can this fraction be expressed as a rational number?
这个分数能表示为有理数吗？
the rational number n
Find the rational number between 0 and 1.
找出0和1之间的有理数。
the set of rational numbers
The set of rational numbers is dense.
有理数集是稠密的。
Common mistakes
Rational number can be expressed as a fraction.Rational numbers can be expressed as a fraction.
错误使用单数形式表示一类数。有理数是可数名词，当泛指这类数时，应使用复数形式"rational numbers"。
This is rational number.This is a rational number.
缺少不定冠词"a"。当表示一个有理数时，需要冠词"a"。
Connections
Confusing words
- irrational number
- 无理数 · 有理数是可表示为两个整数之比的数，而无理数不能表示为整数比。
- real number
- 实数 · 实数包括有理数和无理数，而有理数是实数的一个子集。
Word family
- rational numbers
- plural
Learner notes
Grammar Note
可数名词
Learn the forms together
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY.