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直線系
Author:
RueiYi
GeoGebra
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兩位數除以一位數（一）
異分母分數減法
兩組對邊相等的四邊形
四邊形的特性
球体的体积推导
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Quiz on Projection of a Line Segment on a Plane 投影：測驗
Problem1:(md+me+mf)/(ad+be+cf)=a
Percentage(百分法)
椭圆的定义
微積分基本定理的副本
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Parabola
Median Line
Perimeter
Probability
Volume