有理數
有理數(Rational number)係全部可以用兩隻整數嗰比例表示得正嗰實數，即係分數。有理數包括一切整數同到循環小數，像0=0/1、3=3/1、1/3、0.77777...=7/9, -1, 0.1=0.10000...
等等。
二嗰開方、π 、e 同到 1.23456789101112131415161718192021......都伓係有理數。
一般認為「有理」箇隻名子("rational") 其實係「比例性」("ratio-nal")嗰誤解。
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