【应用题】
1.难度:★★★
一项工程,甲单独完成需要file:///C:/Users/PC/AppData/Local/Temp/msohtmlclip1/01/clip_image002.gif天,乙单独完成需要file:///C:/Users/PC/AppData/Local/Temp/msohtmlclip1/01/clip_image004.gif天.若甲先做若干天后乙接着做,共用file:///C:/Users/PC/AppData/Local/Temp/msohtmlclip1/01/clip_image006.gif天完成,问甲做了几天?
2.难度:★★
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