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包絡線1
Author:
chen mingchuan
GeoGebra
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四邊形的特性
兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形
拼砌四邊形
【案例】2018年全国1卷理科12题
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分數加法和減法
Quiz on Solving Compound Inequalities 解複合不等式：測驗
畢氏定理倒水法
sym1
随机数表
Discover Topics
Conic Sections
Reflection
Division
Cone
Normal Distribution