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教学素材：正切函数及其反函数
Author:
清风拂琴，陌上花开
GeoGebra
New Resources
三位數除以一位數（二）
三位數除以一位數（一）
球體建築師
四邊形的特性
柱體建築師
Discover Resources
Quiz on the N-th Term of a Sequence 數列的第n項：測驗
七巧板
projection01 by Mr LO WY
地球儀繪製
中心投影、平行投影
Discover Topics
Triangles
Coordinates
Plane Figures or Shapes
Interest Calculation
Differential Equation