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markfang
GeoGebra
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活动三：应用性质
第八周作业
中华人民共和国国旗
常见四边形是否是双心四边形
正方形雪花图案
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練習 - 反射對稱
Rounding Quiz (Combined) 小數位及有效數字：同步測驗
GGB8
大小相同串珠
爱奇艺
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Congruence
Similar Triangles
Algebra
Constructions
Sequences and Series