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發(fā)布時間: 2024-07-05 09:49:26
古錢幣|六年級奧數(shù)題及答案
?某仿古錢幣直徑為4厘米,錢幣內(nèi)孔邊緣恰好是圓心在錢幣外緣均勻分布的等弧(如圖).求錢幣在桌面上能覆蓋的面積為多少?
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