尺规作图正多边形 画一个以a为边的正六边形(要求尺规作图,并要求写作法,保留作...

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除了15,其他的都不行!尺规作图可作的正多边形非常有限,30以内的只有3,4,5,6,8,10,12,15,16,17,20,24,30

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