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parabola, b varies, a, c fixed
Author:
perspect
GeoGebra
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直線的斜率：水平變化 & 鉛垂變化
常见四边形是否是双心四边形
百分數及其應用
第三周作业效果演示
异形操场
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公弦
区域面积
三角函數圖形（全）
圆锥曲线的第二定义的副本
線的面化
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Addition
LCM and GCD
Rectangle
Arithmetic Operations
Linear Programming or Linear Optimization