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chengshihfeng
GeoGebra
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四邊形的特性
画直线等分三角形的面积
兩位數除以一位數(一)
兩位數除以一位數(二)
判斷球體
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佑玟ggb book
六年級_正方體截面
六年級_截面_錐體_多邊形
根據百分率找數量(一): 例3的副本
圆在折线上滚动
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Ratios
Congruence
Fractions
Means
Linear Programming or Linear Optimization