Last Updated
：2026/01/08
虚数
Hiragana
きょすう
Noun
Japanese Meaning
虚数：実数ではなく、実数の平方根では表せない数で、通常は虚数単位 i を用いて表される数。 / 虚数：複素数のうち、実部が 0 で虚部のみをもつ数。 / 虚数：方程式 x^2 + 1 = 0 の解として導入される数で、i および -i に代表される。
Easy Japanese Meaning
じぶんをにかいかけると、れいよりちいさくなると考える、とくべつなかず。
Chinese (Simplified) Meaning
形如 bi 的数（b 为实数，i 为虚数单位） / 平方为负实数的数 / 复数中仅含虚部的数
Chinese (Traditional) Meaning
數學中，i 的倍數的數（i^2 = -1） / 實部為 0 的複數；與實數相對
Korean Meaning
i(√−1)의 실수배로 표현되는 수 / 실수부가 0인 복소수
Indonesian
bilangan kompleks berbentuk b i (dengan b bilangan real) / bilangan yang kuadratnya bernilai real negatif / akar dari bilangan real negatif, dinyatakan dengan satuan imajiner i
Vietnamese Meaning
số ảo / số có dạng k·i (k là số thực)
Tagalog Meaning
bilang imahinaryo / numerong imahinaryo / bilang na may anyong k·i, kung saan k ay tunay na bilang
Sense（1）
an imaginary number
（ canonical ）
（ romanization ）
（ kyūjitai ）
（ hiragana ）
Quizzes for review
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虚数
See correct answer
An imaginary number is a concept of a number different from a real number, which is a number whose square root is a negative number.
An imaginary number is a concept of a number different from a real number, which is a number whose square root is a negative number.
See correct answer
虚数は実数とは異なる数の概念で、平方根が負の数になる数です。
Japanese - English
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