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周长相等，正方形，长方形和正三角形，圆面积大小比较
Author:
冯圣军
Topic:
Square
,
Triangles
GeoGebra
New Resources
四邉形 (四年級) 教師版
兩位數除以一位數（二）
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【案例】2018年全国1卷理科12题
柱體建築師
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行程圖 (Travel Graph)
Quiz on Solving One-step Linear Equations (1) | 解「一步」一次方程：測驗(1)
不規則圖形的周界(T)
雙曲線軌跡
里约奥运火炬花环模型
Discover Topics
Sequences and Series
Variance
Straight Lines
Cylinder
Matrices