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假设你手上还有一把没有刻度的直尺和一个圆规,则你可以在有限步内做出任意长度为有理数的线段。该问题的解法其实就来源于对于四则运算最朴实的认识。
Assuming you also have an unmarked ruler and a compass on hand, you can make segments of any length rational in finite steps. The solution to this problem actually comes from the simplest understanding of the four operations.