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六上：圆的面积公式推导
Author:
钟秀群
Topic:
Circle
GeoGebra
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兩位數加法
判斷球體
兩組對邊相等和有直角的四邊形
異分母分數減法
【案例】圆柱体内放置一个大球六个小球
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最短距離
勝者即正義，可愛即正義~
內擺線
Cross Product for 2D Vectors (平面外積)
三角形三边关系探究习题
Discover Topics
Multiplication
Trapezoid
Linear Programming or Linear Optimization
Parallelogram
Intersection