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實數可以分為有理數和無理數兩類,或正實數,負實數和零三類,或代數式和超越數三類.我們平常生活、學習中碰到的數都是實數. 虛數就是指數幂是負數的數.如果有一個數的平方是負數,那這個數就是虛數了,例:x^2=-1,那麼x就是虛數.
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