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A的影响
Author:
军云
GeoGebra
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找出對稱軸
兩位數加法
三位數除以一位數（二）
算柱 (兩位數)
【案例】2018年全国1卷理科12题
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大樂透開獎機有特別號
Proof2 周子翔
半圓內切球內切圓
七巧板
三角函数变换
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Difference and Slope
Optimization Problems
Parabola
General Quadrilateral
Combinatorics