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部分佔全部的百分率: 例1的副本
Author:
冯圣军
,
GeoGebra Institute of Hong Kong
GeoGebra
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判斷球體
異分母分數減法
近似值：有效數字
兩組對邊相等和有直角的四邊形
兩位數加法
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緯度、日照、影子長。
(006)80201辛宇婕
三角形
橢圓2--四圓心近似法
辽南协作校10题
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Right Triangles
Tree Diagrams
Trapezium
Intersection
Trigonometry