7090| 12
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只用圓規(guī)如何把圓周平均分7,8,9,11分 |
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點評
我一般是算出周長,除等分?jǐn)?shù),再算出每條邊長。畫個圓,然后以邊長為半徑依次畫與分度圓的相切的圓弧
評分
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