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長方形
Author:
Yip Chi Wai
GeoGebra
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異分母分數減法
兩位數除以一位數（二）
四邊形的特性
兩組對邊相等和有直角的四邊形
【案例】圆柱体内放置一个大球六个小球
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複數等比級數 (4.4)
九點圓
牛頓定理一
L: y=mx+1
俄罗斯方块（第二版）
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Stochastic Process or Random Process
Differential Equation
Area
Matrices
Rotation