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共有20道题,答对一题得5分,答错一题扣2分,不答不得分,有一题未答,总成绩在80分以上,我至少答对了多
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共有20道题,答对一题得5分,答错一题扣2分,不答不得分,有一题未答,总成绩在80分以上,我至少答对了多
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答案和解析
设答对x题
依题意得5x-2(20-1-x)≥80
解得x≥118/7
x最小为17(取整值)
答:至少答对17题.
依题意得5x-2(20-1-x)≥80
解得x≥118/7
x最小为17(取整值)
答:至少答对17题.
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