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perimeter
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Tmw
GeoGebra
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【案例】2018年全国1卷理科12题
兩位數加法
sanjiaohanshu
兩組對邊相等的四邊形
兩組對邊相等和有直角的四邊形
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happy new year
根據百分率找數量(二): 例4
S2 ch2.3 simultaneous equation
同心圓+等分割線
平均線
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Trapezium
Expected Value
Sine
General Quadrilateral
Trigonometry