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kwok ka yan
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【案例】2013年安徽高考15题
兩位數加法
找出對稱軸
三位數除以一位數（二）
錐體建築師
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S5 geometry
Quiz on Rectangular Coordinates (1) 直角坐標測驗1
滚动的三角形
雙曲線1--焦點法
Twghmkc_時鐘
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Optimization Problems
Diagrams
Quadratic Equations
Orthocenter
Arithmetic