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vinnyya
GeoGebra
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兩組對邊相等的四邊形
判斷球體
四邉形 (四年級) 教師版
第八周作业
三位數除以一位數（一）
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任意角的三角比
Simultaneous Linear Equations 聯立二元一次方程
三角函數
圓與三角形
測試繪本
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Mathematics
Constructions
Division
Subtraction
Root