Meaning of HCF 最大公因數的意義

Drag the black points and the red point to find common factors of two or three numbers (not greater than 100). 拖拉黒色點調整數值，然後拖拉紅色點來找出最大公因數。

gMath 互動數學教室 http://www.geogebra.hk

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