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9.1 - 直角座標上的三角比
Author:
W.L. Wong, Albert
GeoGebra
New Resources
兩位數加法
兩組對邊相等的四邊形
兩位數除以一位數（二）
近似值：有效數字
判斷球體
Discover Resources
Sequence指令練習(包絡線：拋物線)
外角和
小二均分
slide
旋轉+伸縮正多邊形
Discover Topics
Probability
Arithmetic
Square
Standard Deviation
Set Theory