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上和與下和
Author:
yuchengda
Topic:
Geometry
GeoGebra
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兩位數除以一位數（二）
異分母分數減法
兩組對邊相等和有直角的四邊形
兩組對邊相等的四邊形
判斷球體
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Tangent to circle
Problem1:(md+me+mf)/(ad+be+cf)=a
test
描点法画函数图像
勾股定理的直观证明（义务教育数学 新课标-例82）
Discover Topics
Conic Sections
Subtraction
Exponent
Secant Line or Secant
Cone