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旋轉正方形
Author:
33陳郁婷
GeoGebra
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【案例】2018年全国1卷理科12题
兩組對邊相等和有直角的四邊形
四邉形 (四年級) 教師版
兩位數除以一位數（二）
三位數除以一位數（一）
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proof69 陳庠宇
三圓相切
wind
circle
小题狂做P60No2
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Expected Value
Cube
Difference and Slope
Geometric Mean
Combinatorics