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Author:Ng KC

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拼砌四邊形
四邉形 (四年級) 教師版
【案例】2018年全国1卷理科12题
柱體建築師
兩組對邊相等的四邊形

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earth
滑桿動畫
三角形不等式
椭圆的中点弦的轨迹.许兴华数学
完全图及其变形

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Hyperbola
Upper and Lower Sum or Riemann Sum
Circle
Confidence Interval
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