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将军饮马问题
Author:
陈宜红
GeoGebra
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直線的斜率
垂直線的斜率
祖冲之的期望：内棋与外棋
圓周公式的應用
三位數除以一位數（一）
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conjugate
試算表的很多正方形
圓柱截橫
异面直线立方体
图形的放大与缩小.许兴华数学
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Upper and Lower Sum or Riemann Sum
Statistics
Equations
Arithmetic
Fractions