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y=a(x-h)²+k
Author:
李春培
y=a(x-h)²+k
GeoGebra
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兩組對邊相等和有直角的四邊形
画直线等分三角形的面积
球体的体积推导（优化版）
兩位數除以一位數（二）
柱體建築師
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初中九年级数学期中考试试题
極線對偶定理 / polar duality theorem
homework
Slope 斜率 - 概念及定義 (3)的副本
在釘點紙上畫三角形
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Ratios
Line Segment
Cylinder
Probability
Derivative