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翰林數學_2下_CH4-2_特殊平行四邊形有關對角線的性質
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翰林數學
GeoGebra
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三位數除以一位數（一）
兩組對邊相等的四邊形
算柱 (兩位數)
【案例】2018年全国1卷理科12题
近似值：有效數字
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Ex5C#5
test
定周长的正多边形面积变化规律
異側AP-BP最大值
謝爾賓斯基三角形
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Variance
Vectors
Logic
Right Triangles
Vectors 2D (Two-Dimensional)