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練習－由一元二次方程判別根的數目
Author:
Lau Sir
GeoGebra
New Resources
兩位數加法
兩位數除以一位數（二）
三位數除以一位數（一）
判斷球體
四邊形的特性
Discover Resources
藝術
反射定律 Law of Reflection
RECTANGLE
asdasd
平面截圆柱体
Discover Topics
Trigonometric Functions
Solids or 3D Shapes
Root
Conditional Probability
Arithmetic Operations