小花在此次比赛中答错了几道题
- 时间:2020-05-31 15:41:53
- 分类:数学世界
- 阅读:74 次
群中“怪盗”同学分享问题:一次口算比赛,规定:答对一题得8分,答错一题扣5分。小花答了18道题,得92分,小花在此次比赛中答错了几道题?
数学题解答:这是一道类似于“鸡兔同笼”的问题,可以用假设法解决。
假设题目全部答对,可得:18×8=144(分)。
实际只得了92分,少得了:144-92=52(分)。
答对一题与答错一题,所得分数相差:8+5=13(分)。
少得了52分,说明答错了:52÷13=4(题)。
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