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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