GeoGebra
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GeoGebra
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若隐若现的白点
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宋晓燕
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全等三角形
相反数 思考（教材第10页）
Copy of Triangular Number
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定积分
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Copy of Factorization of Quadratic Polynomials (Table Method) 因式分解一元二次多項式（表格法）
堆叠方块
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