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title: Imaginary Numbers
localeTitle: 虚数
## 虚数
虚数“i”简单地定义为-1的平方根。换句话说，i 2 = -1。使用虚数（或其他人称之为复数）的原因之一是，您可以操纵包含平方根-1的方程式或表达式。
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