①大圆的半径是5cm,小圆的半径是2cm,大圆与小圆的周长之比为( ),小圆与大圆的面积之比为()判断三分之一:二十分之一和八分之五:三十二分之三可以组成比例.( )一根铁丝剪成同样
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![①大圆的半径是5cm,小圆的半径是2cm,大圆与小圆的周长之比为( ),小圆与大圆的面积之比为()判断三分之一:二十分之一和八分之五:三十二分之三可以组成比例.( )一根铁丝剪成同样](/uploads/image/z/4538618-26-8.jpg?t=%E2%91%A0%E5%A4%A7%E5%9C%86%E7%9A%84%E5%8D%8A%E5%BE%84%E6%98%AF5cm%2C%E5%B0%8F%E5%9C%86%E7%9A%84%E5%8D%8A%E5%BE%84%E6%98%AF2cm%2C%E5%A4%A7%E5%9C%86%E4%B8%8E%E5%B0%8F%E5%9C%86%E7%9A%84%E5%91%A8%E9%95%BF%E4%B9%8B%E6%AF%94%E4%B8%BA%EF%BC%88+%EF%BC%89%2C%E5%B0%8F%E5%9C%86%E4%B8%8E%E5%A4%A7%E5%9C%86%E7%9A%84%E9%9D%A2%E7%A7%AF%E4%B9%8B%E6%AF%94%E4%B8%BA%EF%BC%88%EF%BC%89%E5%88%A4%E6%96%AD%E4%B8%89%E5%88%86%E4%B9%8B%E4%B8%80%EF%BC%9A%E4%BA%8C%E5%8D%81%E5%88%86%E4%B9%8B%E4%B8%80%E5%92%8C%E5%85%AB%E5%88%86%E4%B9%8B%E4%BA%94%EF%BC%9A%E4%B8%89%E5%8D%81%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%89%E5%8F%AF%E4%BB%A5%E7%BB%84%E6%88%90%E6%AF%94%E4%BE%8B.%EF%BC%88+%EF%BC%89%E4%B8%80%E6%A0%B9%E9%93%81%E4%B8%9D%E5%89%AA%E6%88%90%E5%90%8C%E6%A0%B7)
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