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三角形三边的关系
Author:
杨秀芬
GeoGebra
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兩位數加法
球体的体积推导（优化版）
判斷球體
球体的体积推导
兩組對邊相等的四邊形
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二元一次不等式-極大值極小值
笛卡兒之心
Copy of Factorization of Quadratic Polynomials (Table Method) 因式分解一元二次多項式（表格法）
高考椭圆题的动态演示2.许兴华数学
金印的展开图
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Multiplication
Hypothesis Testing
Pythagoras or Pythagorean Theorem
Rotation
Similar Triangles