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20200417平面直角坐标系复习T14（3）
Author:
陈敦莹
GeoGebra
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兩組對邊相等和有直角的四邊形
兩位數加法
錐體建築師
兩組對邊相等的四邊形
sanjiaohanshu
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分段移動
normal vector
Bearings(方位)
心脏线切线族
分数减法 Fraction Subtraction
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Scalene Triangles
Rectangle
Kite
Set Theory
Logic