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philiplui
GeoGebra
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算柱 (兩位數)
直角坐標平面上的旋轉變換
兩組對邊相等的四邊形
第八周作业
三位數除以一位數（二）
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ie 3
比例中的定值問題(一)
乘法加工
函數
椭圆的一种简单画法.许兴华数学
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Integral Calculus
Surface
Frequency Distribution
Isosceles Triangles
Pythagoras or Pythagorean Theorem