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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
兩位數除以一位數（二）
異分母分數減法
三位數除以一位數（二）
四邊形的特性
找出對稱軸
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斜率
參數式_1
湯圓rice ball
基础知识
反射原理的副本
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Distributions
Circle
Sequences and Series
Matrices
Differential Equation