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Copy of 銳角三角：sin, cos
Author:
Gideon Huang
,
羅驥韡 (Pegasus Roe)
GeoGebra
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球体的体积推导
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兩位數加法
兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形
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中考数学压轴题大放送之十四
分數乘法與除法
(001)80201辛宇婕
分割正方体
达芬奇椭圆仪
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Percentages
Equilateral Triangles
Trigonometry
Tangent Line or Tangent
Scalene Triangles