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相反数 探究 （教材第9页）
Author:
陈力
Topic:
Algebra
GeoGebra
New Resources
畫出對稱圖形
錐體建築師
兩位數除以一位數（二）
判斷球體
sanjiaohanshu
Discover Resources
TOPVINKEL
軌跡二︰移動點與兩固定點保持相等距離(垂直平分線)
曲線上的箭頭 (Arrow on Curve)
等角作圖
congruent triangle_provided by Mr Yeung Kar Chun
Discover Topics
Conditional Probability
Combinatorics
Symmetry
Natural Numbers
Piecewise Functions