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11-18的加減組合
Author:
Yin Kelvin Wong
GeoGebra
New Resources
畫出對稱圖形
三位數除以一位數（二）
找出對稱軸
兩組對邊相等的四邊形
異分母分數減法
Discover Resources
二項分布與抽樣
這好難用
triangle
密鋪8
探究判定全等三角形的条件（SAS）！
Discover Topics
Addition
Complex Numbers
Piecewise Functions
Mathematics
Arithmetic Operations