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sinα + sinβ > 0 ?
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
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四邉形 (四年級) 教師版
兩組對邊相等和有直角的四邊形
【案例】2013年安徽高考15题
異分母分數減法
兩位數除以一位數（二）
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Solving Triangles (SSA case) 解任意三角形(SSA情況)
指數1209
三角測量01
橢圓練習
乘法表的自动练习的副本
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Cuboid
Scalene Triangles
Conditional Probability
Variance
Parabola