(列方程)一份试卷上共有25道选择题,做对一道题得4分,错一道扣1分,某同学得了90分,他作对了几道
问题描述:
(列方程)一份试卷上共有25道选择题,做对一道题得4分,错一道扣1分,某同学得了90分,他作对了几道
答
(100-90)/(4+1)=2,错2题,作对了23道题.
(列方程)一份试卷上共有25道选择题,做对一道题得4分,错一道扣1分,某同学得了90分,他作对了几道
(100-90)/(4+1)=2,错2题,作对了23道题.