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GeoGebra
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異分母分數減法
兩組對邊相等的四邊形
四邊形的特性
三位數除以一位數(二)
錐體建築師
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Lap / 9
Primary Mathematics
GGB1
实心曲面几何体
龜甲
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Quadratic Equations
Congruence
Parallelogram
Rhombus