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特製的門 2
Author:
李春培
特製的門2
https://www.facebook.com/video.php?v=730160733696759&fref=nf
GeoGebra
New Resources
兩組對邊相等的四邊形
異分母分數減法
球體建築師
兩位數加法
三位數除以一位數（一）
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莫比烏斯帶02
v中點座標軌跡(圓大正多邊形小)
HW question locus 3
hjzx123456
Illusion-平行线错觉
Discover Topics
Root
Probability
Multiplication
Geometric Mean
Dilation