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S1E2 jastrow illusion
Author:
学用数学
,
acchu
GeoGebra
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兩組對邊相等的四邊形
畫出對稱圖形
三位數除以一位數（二）
兩組對邊相等和有直角的四邊形
異分母分數減法
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L: y=mx+1
圓與切線
正多邊形邊上點旋轉
謝謝 80335 盧沛宏
Ext angle cyclic quad
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Symmetry
Ellipse
Subtraction
Integers
Similar Triangles