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一元一次方程的应用既是七年级数学的第三章内容,更是初中数学的一个重要组成部分。尤其是“盈不足”问题不但是古今中外学者在不断探索的常见问题,也是七年级考试的一个热点题型。但列方程解“盈不足”类型应用题一直是初中学生的一个难点,也是学生的一种易错题型。教师在教这一知识时,有时也显得力不从心,即使把课本上相关的题型一个一个地讲解过去,但只要脱离教师的指点,学生做这一类题时就会错误不断。对“盈不足”这种题型进行有效的教学,使学生能熟练掌握,对后续学习将产生很大的影响。
The application of a one-time equation is not only the third chapter of seventh grade mathematics, but also an important part of junior high school mathematics. In particular, the problem of “insufficient profit” is not only a common problem constantly explored by scholars both at home and abroad, but also a hot topic for seventh grade examinations. But the column equation solution “deficit ” type application problem has been a difficult junior high school students, but also a student error-prone type. When teachers teach this knowledge, sometimes can not help themselves, even though the textbooks on the related questions one by one to explain the past, but as long as teachers from pointing out, when students do this kind of problem will be wrong. Effective teaching of the inscription “Insufficient Profit” can make the students proficient and have a great influence on the follow-up study.