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不少学生由于习惯于列方程解应用题,遇到实际问题中的不等量关系不大会处理,其实列不等式和列方程解应用题相类似,首先要正确设未知数,然后根据题设条件中的不等量关系,列出不等式(组),解这个不等式(或不等式组),再根据未知数的实际意义,有的需要取不等式(组)的整数解,才能得到应用题的解。现以近年中考试卷中有关试题为例来说明。
Many students are accustomed to applying equations to equations, and the unequal relations encountered in practical problems are not handled. In fact, column inequalities and column equations are similar in solving problems. First, the unknowns must be correctly set, and then the conditions should be set according to the questions. The inequality relations, lists inequalities (groups), solution of the inequality (or inequality group), and then according to the actual meaning of the unknown, some need to take the inequality (group) of the integer solution in order to get the solution to the application. The relevant examination questions in the recent examination papers will be used as an example.