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1989全国文14
Author:
常振虎
GeoGebra
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近似值：有效數字
三半圓間的相切圓(Codex╱2026.10.07)
中華民國國旗 (Codex╱2026.10.06)
四邊形的特性
畫出對稱圖形
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切3塊拼成正方形
concurrence of medians and bimedians of tetrahedron
All in one (centres of triangle)
Angles in intersecting and parallel lines
高考真题椭圆
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Quadrilaterals
Addition
Differential Calculus
Rhombus
Binomial Distribution