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将三角形面积一分为二
Author:
谢鹏
GeoGebra
New Resources
兩位數除以一位數（二）
直角坐標平面上的旋轉變換
兩組對邊相等的四邊形
球體建築師
判斷球體
Discover Resources
數值滑桿
旋转文本
Ex5C#10
pyramid by Mr LO WY
C60足球模型展开（单色版）
Discover Topics
Arithmetic
Pie Chart or Circle Chart
Addition
Terms
Plane Figures or Shapes