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一年一度的全国初中数学竞赛,激发了广大中学生学习数学的积极性,本文选编了几道数学竞赛试题,并给予解答,供有兴趣的读者参考. 1、某次数学测验共有十道选择题,评分办法是:每一题答对得4分,答错得-1分,不答得0分.设这次测验至多有n种可能的成绩,则n应该等于: (A)42;(B)45;(C)46;(D)48;(E)以上答案都不对.(选自北京1983年初中数学竞赛题) 解据题意,考生最多可得40分,最少得
The annual national junior high school math competition has stimulated the enthusiasm of the majority of middle school students to study mathematics. This paper has selected several mathematical contest questions and given answers for interested readers. 1. There are ten multiple-choice questions for a certain number of tests. The scoring method is: 4 points for each question, 1 point for wrong answers, and 0 points for no answer. There are at least n possible results for this test, then n should be equal to: (A)42; (B) 45; (C) 46; (D) 48; (E) None of the above answers. (From the 1983 math contest in Beijing early in the middle of the year) According to the meaning of the questions, candidates can get up to 40 points, at least