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西安市第五十三中学 符成岗
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符成岗
GeoGebra
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兩組對邊相等的四邊形
異分母分數減法
四邉形 (四年級) 教師版
【案例】2018年全国1卷理科12题
四邊形的特性
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An angle problem
COS 特別角
Summary
時鐘
抛豆实验
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Quadratic Equations
Limits
Algebra
Median Line
Solids or 3D Shapes