Definition

Examples

• 有理数和無理數都是實數。
  yǒu lǐ shù hé wúlǐ shù dōu shì shíshù.
  Rational numbers and irrational numbers are both real numbers.
• 任何整數都可以寫成一個有理数。
  Rènhé zhěngshù dōu kěyǐ xiě chéng yí gè yǒu lǐ shù.
  Any integer can be written as a rational number.
• 這個分數不是一個有理数，因為分母是零。
  Zhège fēnshù bú shì yí gè yǒu lǐ shù, yīnwèi fēnmǔ shì líng.
  This fraction is not a rational number because the denominator is zero.