初等数学并不能严格定义自然数、整数、有理数、实数等，可为什么能用初等数学方法证明根号 2 是无理数？ 知乎 Sketch Coloring Page

初等数学并不能严格定义自然数、整数、有理数、实数等，可为什么能用初等数学方法证明根号 2 是无理数？ 知乎 Template

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