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angles sum on a striaght line
Author:
LAM YU SANG
GeoGebra
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兩位數加法
【案例】2013年安徽高考15题
兩位數除以一位數（二）
異分母分數減法
画直线等分三角形的面积
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色彩視覺藝術
test123
二次曲線-2.拋物線
（三）观察物体
翰林數學_2下_CH3-1_多邊形的內角和
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Scalene Triangles
Quadratic Equations
Rhombus
Hyperbola
Exponential Functions