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試證明：A=B+C
Author:
顏士勛
GeoGebra
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【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）
【案例】圆柱体内放置一个大球六个小球
四邉形 (四年級) 教師版
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三角函數
pentagon
test
Solving Triangles (Ambiguous SSA case)
F4_Ch9.1 任意角的三角比
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Addition
Differential Calculus
Trigonometric Functions
Scalene Triangles
Confidence Interval