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illusion 鏡射
Author:
arist
GeoGebra
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三位數除以一位數（一）
四邊形的特性
兩位數除以一位數（一）
異分母分數減法
找出對稱軸
Discover Resources
正n邊形內角與外角
根據百分率找數量（一）: 例4
sin&cos
例子
随机三角形背景
Discover Topics
Trigonometry
Parabola
Means
Linear Programming or Linear Optimization
Intersection