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整數的減法5：CheckBox 與單選題
Author:
arist
GeoGebra
New Resources
錐體建築師
異分母分數減法
第八周作业
sanjiaohanshu
三位數除以一位數（二）
Discover Resources
切線斜率
相切的三圓
滾動的圓
三角形
冥函数
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Means
Congruence
Histogram
Geometric Distribution
Trapezoid