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Author:
吕玉雷
GeoGebra
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兩組對邊相等和有直角的四邊形
四邊形的特性
【案例】2018年全国1卷理科12题
錐體建築師
球体的体积推导(优化版)
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大樂透開獎機有特別號
生活
兩位數除法
earth
淘宝网
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Upper and Lower Sum or Riemann Sum
Continuity
Pyramid
Triangles
Matrices