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诱导公式四（原点对称关系）
Author:
桃篮翁
GeoGebra
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画直线等分三角形的面积
兩組對邊相等和有直角的四邊形
兩位數除以一位數（二）
判斷球體
球體建築師
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Graphs of Linear Equations in Two Unknowns 二元一次方程的圖像
分數減法
khkhk
「相似三角形」任务1的副本
盈利與虧蝕
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Kite
Median Value
Median Line
Inequalities
Linear Functions