我市举行“八荣八耻”知识竞赛,总共50道抢答题,比赛规则为抢答对一题得3分,抢答错一题倒扣1分,不抢答得0分.小军参加了
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:综合作业 时间:2024/07/27 17:54:19
我市举行“八荣八耻”知识竞赛,总共50道抢答题,比赛规则为抢答对一题得3分,抢答错一题倒扣1分,不抢答得0分.小军参加了这次比赛,只抢答了其中20道题,要使最后得分不少于50分,问小军至少要答对多少道题?
![我市举行“八荣八耻”知识竞赛,总共50道抢答题,比赛规则为抢答对一题得3分,抢答错一题倒扣1分,不抢答得0分.小军参加了](/uploads/image/z/8519449-49-9.jpg?t=%E6%88%91%E5%B8%82%E4%B8%BE%E8%A1%8C%E2%80%9C%E5%85%AB%E8%8D%A3%E5%85%AB%E8%80%BB%E2%80%9D%E7%9F%A5%E8%AF%86%E7%AB%9E%E8%B5%9B%EF%BC%8C%E6%80%BB%E5%85%B150%E9%81%93%E6%8A%A2%E7%AD%94%E9%A2%98%EF%BC%8C%E6%AF%94%E8%B5%9B%E8%A7%84%E5%88%99%E4%B8%BA%E6%8A%A2%E7%AD%94%E5%AF%B9%E4%B8%80%E9%A2%98%E5%BE%973%E5%88%86%EF%BC%8C%E6%8A%A2%E7%AD%94%E9%94%99%E4%B8%80%E9%A2%98%E5%80%92%E6%89%A31%E5%88%86%EF%BC%8C%E4%B8%8D%E6%8A%A2%E7%AD%94%E5%BE%970%E5%88%86%EF%BC%8E%E5%B0%8F%E5%86%9B%E5%8F%82%E5%8A%A0%E4%BA%86)
(20×3-50)÷(3+1),
=10÷4,
=2.5(道);
2.5是小数,要使小军最后得分不少于50分,他答错的题不能超过2道,
所以小军至少要答对:20-2=18(道);
答:小军至少要答对18道题.
=10÷4,
=2.5(道);
2.5是小数,要使小军最后得分不少于50分,他答错的题不能超过2道,
所以小军至少要答对:20-2=18(道);
答:小军至少要答对18道题.
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