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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 投票中
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數學練習卷
Nov 2nd 2013, 10:06

*註 分子/分母

甲:他6天可以完成,所以一天平均做1/6

乙:他12天可以完成,所以一天平均做1/12

1/6=2/12

所以,,2/12(甲一天做的)加上1/12(乙一天做的),就是兩個人一天做的喔~~
2/12+1/12=3/12

兩個人一天做3/12,1除以3/12就是答案了
1除3/12是4

可以換算看看:3/12乘4就等於1
1就表示了全部工程做完...

所以答案是4

以上為参考~~
如果有錯誤的話很抱歉嚕~~

參考資料： 我

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