【单选题】In a historyClass that consisted of 30students,the number of seniors was 3more than twice the number of juniors,and of the students were neither juniors nor seniors.
网考网参考答案:C
网考网解析:
一历史班由30名学生组成,高年级学生八数等于低年级学生人数的二倍加3,且有[*]的人既不是低年级学生也不是高年级学生。 设该班中低年级学生人数为x,由题意可得到下面的方程: [*]
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