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IMO2015D

Author:Terence

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異分母分數減法
三位數除以一位數（二）
畫出對稱圖形
直角坐標平面上的旋轉變換
四邉形 (四年級) 教師版

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Clock24hour
腳踏車輪圈
禪繞畫
一數的百分之幾是多少？
三相交流电波形模拟

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Optimization Problems
Rational Numbers
Trigonometric Functions
Integral Calculus
Upper and Lower Sum or Riemann Sum

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