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向量合成
Author:
laoxu
GeoGebra
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拼砌四邊形
畫出對稱圖形
三位數除以一位數（一）
找出對稱軸
【案例】2013年安徽高考15题
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題3
圖形拼砌
Distance(距離公式)
三角函数定积分的动态演示.许兴华数学
"拈" 類遊戲之一-搶21遊戲 The 21 game
Discover Topics
Arithmetic
Statistics
Linear Programming or Linear Optimization
Optimization Problems
Scalene Triangles