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lizhi
GeoGebra
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sanjiaohanshu
三位數除以一位數(一)
兩組對邊相等和有直角的四邊形
小数 的副本
近似值:有效數字
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動態文字2次函數
Triangle
猴子爬樹
我的第一个GGB绘本
开关灯小游戏
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Parallelogram
Kite
Rhombus
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Algebra