一份數(shù)學(xué)試卷有20道選擇題,規(guī)定做對(duì)一題得5分,一題不做或做錯(cuò)扣1分,結(jié)果某學(xué)生得分為76分,該同學(xué)做對(duì)題目的個(gè)數(shù)是····································································································· (  )

A.15      B.16     C.17      D.18

 

答案:B
解析:

設(shè)該同學(xué)做對(duì)題目的個(gè)數(shù)是x道,則

5x-(20-x)=76   x=18

 


提示:

列關(guān)于題目個(gè)數(shù)的方程求解

 


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