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三角形的外心
Author:
侯杰材
GeoGebra
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【案例】2018年全国1卷理科12题
四邊形的特性
兩組對邊相等的四邊形
兩位數除以一位數（一）
球體建築師
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EnergyMath 2-3 複數乘法的幾何意義
立體線圈
动圆在定圆上滚动
growth
練習_對稱
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Trigonometry
Trapezoid
Limits
Parallelogram
Geometric Mean