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同心圓+等分割線
Author:
許清惟
GeoGebra
New Resources
算柱 (兩位數)
異分母分數減法
兩組對邊相等的四邊形
兩位數除以一位數（一）
四邉形 (四年級) 教師版
Discover Resources
優良作品3
Simple Interest 單利息
奶哥要的物件
y=a*sin(b*x)
直線的斜率：水平變化 & 鉛垂變化
Discover Topics
Natural Numbers
Real Numbers
Pyramid
Isosceles Triangles
Multiplication