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兩組對邊相等和有直角的四邊形
異分母分數減法
柱體建築師
【案例】2013年安徽高考15题
三位數除以一位數(一)
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waaachen
旋轉動畫
阿基米德求圓面積
分數的認識
中國火柴遊戲二的副本
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Translation
Straight Lines
Square
Difference and Slope
Calculus