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線性變換矩陣（二階）的副本
Author:
xiaodandan
,
arist
GeoGebra
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四邊形的特性
兩位數除以一位數（二）
找出對稱軸
【案例】2018年全国1卷理科12题
拼砌四邊形
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中學(高中)
BEES定理2
qr code for symmetry
homework3
對稱成分(零序.正序.負序)
Discover Topics
Reflection
Sine
Rotation
Function Graph
Vectors 2D (Two-Dimensional)