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一道三视图的题目（三视图作法参考）
Author:
肖建伟
GeoGebra
New Resources
判斷球體
拼砌四邊形
異分母分數減法
兩組對邊相等和有直角的四邊形
四邊形的特性
Discover Resources
彩虹三角
滑桿ｋ控制ｋ_1,k_2,k_3三數值
圖D
三角形內心
transformation_rotation
Discover Topics
Congruence
Rational Numbers
Quadrilaterals
Cube
Hyperbola