有20道數(shù)學(xué)題,答對(duì)加5分,答錯(cuò)扣2,不答得0,問如果Lucy的得分是一個(gè)質(zhì)數(shù),問你她答對(duì)的題目最多是多少?
滿分是100,100以內(nèi)的質(zhì)數(shù)有2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97,
最大的可能的分?jǐn)?shù)應(yīng)該是83,答對(duì)17題,錯(cuò)一題,2題未答.
There are 20 maths problem in the test .for each right anwer ,you get 5 points .for no anwer ,you get 0 .for each wrong
There are 20 maths problem in the test .for each right anwer ,you get 5 points .for no anwer ,you get 0 .for each wrong answer ,you lose 2 points instead of getting points .if Lucy gets a mark,which is prime number ,the largest number of maths problems she works out is ( )
英語人氣:381 ℃時(shí)間:2020-05-17 13:59:03
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