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20161223 第5題
Author:
3A516057 練鴻裕
GeoGebra
New Resources
兩組對邊相等的四邊形
柱體建築師
三位數除以一位數（一）
四邊形的特性
異分母分數減法
Discover Resources
Congruent Triangles Demo
平行四邊形柱算體積(可以切開)
test
圆锥侧面展开
常见立体的展开图
Discover Topics
Set Theory
Circle
Integral Calculus
Integers
Ratios