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xuhao
GeoGebra
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四邉形 (四年級) 教師版
拼砌四邊形
近似值：有效數字
算柱 (兩位數)
AI 訓練教室
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折扣 例5
Sine Formula 正弦公式
gtx-a01-flag-sesel-01 塞席爾國旗
triangle
perimeter of rectangle
Discover Topics
Line Segment
Triangles
Vectors
Equilateral Triangles
Arithmetic Operations