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chen mingchuan
GeoGebra
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【案例】2013年安徽高考15题
錐體建築師
第八周作业
兩組對邊相等的四邊形
三位數除以一位數（一）
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橢圓規
優質教育基金計劃中期分享會 (26/6/2015)
vbvbvbvc
二次函數圖形01
Circle
Discover Topics
Sequences and Series
Confidence Interval
Surface
Quadratic Functions
Step Functions