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congruent triangle2_provided by Mr Yeung Kar Chun
Author:
kidmancmw
GeoGebra
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小数 的副本
算柱 (兩位數)
三位數除以一位數（二）
近似值：有效數字
兩組對邊相等和有直角的四邊形
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圓繞圓
變色孔雀
Linear Inequalities in Two Unknowns 二元一次不等式
正弦图像
二元一次不等式的解區域判斷
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Distributions
Quadrilaterals
Calculus
Diagrams
Fractal Geometry