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毕氏螺线
Author:
树常青
GeoGebra
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四邊形的特性
兩組對邊相等和有直角的四邊形
兩位數除以一位數（一）
兩位數加法
【案例】2018年全国1卷理科12题
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正n邊形內角與外角
數位學習社
地球儀
Solve ax + b = cx + d
翰林數學_2下_CH3-4_大角對大邊
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Parallelogram
Right Triangles
Interest Calculation
Statistics
Conditional Probability