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平行四邊形_大
Author:
keihin
GeoGebra
New Resources
柱體建築師
【案例】圆柱体内放置一个大球六个小球
異分母分數減法
球體建築師
【案例】2018年全国1卷理科12题
Discover Resources
面積與公式
小數（小四下）
用正多邊形面積逼進圓周率
MeArm機構模擬V.2
中心对称的概念
Quiz on Solving Quadratic Inequalities 解二次不等式：測驗 (v2018)
Discover Topics
Right Triangles
Congruence
Polynomial Functions
Natural Numbers
Straight Lines