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由于实数集合是复数集合的真子集,所以在实数范围成立的公式、法则,不一定在复数范围内成立,须经验证推广后方可使用。也正因为如此,出现一些容易混淆的问题,需要澄清辨明。
Since a real number set is a proper subset of a complex set, formulas and rules that are established in the real range are not necessarily established within a complex number and must be verified and promoted before use. It is precisely because of this that there are some confusing issues that need to be clarified.