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是迴圈數,且迴圈節是一個數. 比如1/9=0.11111… 5/9=0.5555555555555… 如果有整數或者更複雜的,前面的一次除掉,最後是一個類似上面的迴圈 比如12/9=1.333333333333333. 13.2/9=1.4666666666.
【】的7分之6相當於16的4分之3 16*3/4 / 6/7=14
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