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國旗
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Tone
GeoGebra
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異分母分數減法
四邉形 (四年級) 教師版
柱體建築師
【案例】2018年全国1卷理科12题
三位數除以一位數（一）
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向量相加
量角器
Angle (Extended 1)
Copy of 20151104 四邊形 P2
【案例】2018年全国1卷理科12题
Discover Topics
Arithmetic
Ellipse
Differential Equation
Parallelogram
Conic Sections