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ddc1130
GeoGebra
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折扣
常见四边形是否是双心四边形
活动三：应用性质
平行線的判定
第八周作业
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密鋪圖形
Drag C and see
三角形的高
taiwan 2018
研究杠杆平衡条件
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Differential Calculus
Cuboid
Calculus
Definite Integral
Sequences and Series