含字母系数不等式组问题是不等式中常见的问题之一,这类问题大多是已知不等式组的解集,要求确定字母系数的值或取值范围.解决这类问题的关键是在熟练掌握不等式组解法的基础上进行逆向思维,还要注意字母的 The problem with letter coefficient inequality group is one of the most common problems in inequality. Most of these problems are solved sets of known inequality groups, which require to determine the value or range of letter coefficients. The key to solving this kind of problem is to master the inequality Group solution based on the reverse thinking, but also pay attention to the letters