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20190530 與平行線有關的角
Author:
Hui Sir
GeoGebra
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兩組對邊相等和有直角的四邊形
【案例】2018年全国1卷理科12题
兩組對邊相等的四邊形
找出對稱軸
三位數除以一位數（一）
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內外角平分線
line equation
gslsj 三角數列
angle between 2 planes 03
我的第一个绘本
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Percentages
Numbers
Reflection
Cylinder
Exponent