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Author:
徐熙伟
GeoGebra
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兩組對邊相等和有直角的四邊形
兩組對邊相等的四邊形
異分母分數減法
三位數除以一位數（一）
【案例】2018年全国1卷理科12题
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平行四邊形面積教材三
normal
斜率
S2 Chapter11.1 三角形的對鄰斜
翰林數學_2下_CH3-4_大角對大邊
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Fractal Geometry
Polygons
Boxplot
Circumcircle or Circumscribed Circle
Rectangle