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二元一次
Author:
張閎
GeoGebra
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兩組對邊相等和有直角的四邊形
異分母分數減法
三位數除以一位數（一）
兩組對邊相等的四邊形
四邉形 (四年級) 教師版
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rectangle construction
Form 1(中一)
Ex5C#10
gltzk 角錐的兩種展開圖
三視圖
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Random Variables
Set Theory
Pyramid
Rhombus
Differential Calculus