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GeoGebra
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兩組對邊相等和有直角的四邊形
【案例】2018年全国1卷理科12题
四邊形的特性
球体的体积推导(优化版)
兩位數加法
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Area of trapezoid
幾何鋪磚
體積的量度 5
整數乘分數
约瑟夫问题