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平行线（转动木条）
Author:
蔡永志
GeoGebra
New Resources
三位數除以一位數（一）
判斷球體
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
異分母分數減法
Discover Resources
對稱(LEVEL 1)
vertex
講義/試卷 函數圖形 (雙函數)
再作万年历单晨
马鞍面旋转
Discover Topics
Line Segment
Functions
Linear Programming or Linear Optimization
Geometry
Scalene Triangles