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keith leung
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Tim Brzezinski
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GeoGebra
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平行線的判定
正方形雪花图案
异形操场
第三周作业效果演示
斐波那契螺旋弧线(表格法)
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說明用01
向量合成
兩面角
Ex5D#6
KS2 Mathematics
Discover Topics
Statistical Characteristics
Sine
Area
Cosine
Line Segment