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cathycat761031
GeoGebra
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画直线等分三角形的面积
三位數除以一位數(一)
異分母分數減法
兩組對邊相等和有直角的四邊形
拼砌四邊形
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矩陣
判斷錐體 4
圓錐截痕
All in one (centres of triangle)
模拟龟兔画板
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Histogram
Rectangle
Upper and Lower Sum or Riemann Sum
Orthocenter
Reflection