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waaachen
Author:
陳兪宏
圓
GeoGebra
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異分母分數減法
四邊形的特性
三位數除以一位數（一）
兩組對邊相等和有直角的四邊形
找出對稱軸
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軌道
Rounding Quiz (Significant Figures) 有效數字：測驗
Effects on Dispersion
等弧對等角
尺规作图
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Rhombus
Terms
Derivative
General Quadrilateral
Cosine