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波的干涉 Wave Interference
Author:
W.L. Wong, Albert
GeoGebra
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三位數除以一位數（一）
異分母分數減法
畫出對稱圖形
三位數除以一位數（二）
兩組對邊相等的四邊形
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方格紙
柱體建築師 2
Addition and Subtraction of Directed Numbers (1) 有向數加減(1)
circle
二元一次不等式的解
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Trigonometric Functions
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