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GeoGebra
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算柱 (兩位數)
Earth with coastline
近似值：有效數字
四邉形 (四年級) 教師版
兩組對邊相等和有直角的四邊形
Discover Resources
Expectation Value 期望值
優良作品4(薇如)
分數認識
探究平行四邊形面積
選擇合適的「單位」