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Author:
chengshihfeng
GeoGebra
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兩組對邊相等和有直角的四邊形
兩組對邊相等的四邊形
兩位數除以一位數（一）
算柱 (兩位數)
球體建築師
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Math
從長方形的「周界」找回它的「長」和「闊」
練習_對稱
拋物線(上下型)標準式
極線對偶定理 / polar duality theorem 的複本
Discover Topics
Scalene Triangles
Secant Line or Secant
Expected Value
Quadrilaterals
Indefinite Integral