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轮胎
Author:
凉 清
GeoGebra
New Resources
三位數除以一位數（二）
兩位數除以一位數（一）
拼砌四邊形
兩組對邊相等的四邊形
畫出對稱圖形
Discover Resources
龍騰4_1-1習6-1
Dilation of area
Cube
三角形的概念
翰林數學_2下_CH4-3_梯形中線性質
Discover Topics
Trapezoid
Poisson Distribution
Expected Value
Pythagoras or Pythagorean Theorem
Isosceles Triangles