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Trigonometric Ratios of Special Angles 特殊角的三角比
Author:
Alex CHIK
GeoGebra
GeoGebra 互動數學教室
http://www.geogebra.hk
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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
三位數除以一位數（二）
錐體建築師
兩位數加法
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