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固定周界長方形的面積變化（二）
Author:
Anthony OR 柯志明
,
GeoGebra Institute of Hong Kong
Topic:
Area
GeoGebra
New Resources
拼砌四邊形
算柱 (兩位數)
異分母分數減法
兩位數除以一位數（二）
四邉形 (四年級) 教師版
Discover Resources
吳老師幾何題
標準分解式與方根化簡
Trigonometry
极坐标
Modular Surface：1 / (1 + z²)
Discover Topics
Addition
Arithmetic
Trapezium
Power Functions
Equilateral Triangles