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Author:
Ku, Yin Bon (Albert)
GeoGebra
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兩位數除以一位數（二）
三位數除以一位數（一）
球体的体积推导
四邉形 (四年級) 教師版
兩組對邊相等的四邊形
Discover Resources
ie 1
四次函數圖形觀察
四位數
Addition and Subtraction of Polynomials 2 (多項式的加減法2)
制作模版
Discover Topics
Arithmetic Operations
Vectors
Vectors 2D (Two-Dimensional)
Sine
Optimization Problems