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Perpendicular lines

Author:Ng KC

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

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圆的面积展开
堆疊(圓、正方形、正三角形)
立體圖形的截面
Locus (Parallel lines)
地球儀

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Sphere
Histogram
Quadrilaterals
Continuity
Arithmetic Operations

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