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包含除法（1 ÷分數）的副本
Author:
xiaodandan
,
GeoGebra Institute of Hong Kong
Topic:
Fractions
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兩組對邊相等的四邊形
球體建築師
近似值：有效數字
sanjiaohanshu
小数 的副本
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三角形外心
堆垛
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