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陳隆期
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Novos Materiais
圓的切線方程
折扣
第三周作业效果演示
龙形曲线-分形龙
常见四边形是否是双心四边形
Descubra Materiais
Perigal's Dissection
Quiz on Mixed Arithmetic Operations of Positive Integers 正整數四則混合運算：測驗
畢氏定理
拋物線有範圍限制的極值
我的第一个绘本
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Aritmética