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proof 49 黃彥淇
Author:
郭亮偉
GeoGebra
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兩位數除以一位數（二）
兩組對邊相等和有直角的四邊形
球體建築師
判斷球體
異分母分數減法
Discover Resources
constant function
初心者的進化
test03
Circumcentre
圖一 的複本
Discover Topics
Geometric Mean
Area
Sequences and Series
Rational Numbers
Cosine