实数
From Wikipedia, the free encyclopedia
实数，是有理数搭无理数个总称，前者如0、−4、81 / 7；后者如根号2、π等。实数可以直观地看作小数（有限或无限的），渠拉能把数轴“填满”。但仅仅以枚举个方式不能描述实数个全体。实数搭虚数共同构成复数。
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