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Petlach Wave

Author:魏向东

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畫出對稱圖形
【案例】2018年全国1卷理科12题
三位數除以一位數（二）
算柱 (兩位數)
兩位數除以一位數（二）

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Test1
有向數
大園寶
外接圓的心
翰林數學_2下_CH3-4_扣條

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Sine
Probability
Solids or 3D Shapes
Quadrilaterals
Optimization Problems

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