小圆的半径是5cm,大圆半径是7cm,小圆和大圆周长的比是(),面积的比是()
人气:230 ℃ 时间:2019-08-21 09:26:36
解答
小圆的半径是5cm,大圆半径是7cm,小圆和大圆周长的比是(5:7),面积的比是(25:49)
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