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Tangent from an external point
Author:
jaycheung2016plk
GeoGebra
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兩位數除以一位數（二）
兩位數除以一位數（一）
兩組對邊相等的四邊形
拼砌四邊形
【案例】2018年全国1卷理科12题
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對數的遞增或遞減(底數大於1)
正立方體與平面的截面
連鎖法則 (Chain Rule)
Reuleaux triangle 掃地機器人v1.0
第六次:20190412
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Vectors
Sine
Fractal Geometry
Means
Conic Sections