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angle 123
Author:
zhihuai1982
GeoGebra
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拼砌四邊形
【案例】2018年全国1卷理科12题
異分母分數減法
球體建築師
兩組對邊相等和有直角的四邊形
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呼拉圈
Easter egg
Apollonius Problem 4 LLP Power 12
三角形數
钟表制作成功啦
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Secant Line or Secant
Plane Figures or Shapes
Linear Regression
Prism
Differential Equation