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Author:
wangjiezailai
GeoGebra
New Resources
平行線的斜率
龙形曲线-分形龙2
百分數及其應用
祖冲之的期望：内棋与外棋
双心四边形
Membuka sumber
證平行四邊形 (對邊相等)
gjh-h01-01 畢氏數三角形
莫比烏斯帶01
垂心應用
Copie de Comparing fractions using number lines and rectangles