不等式是高中数学的重点内容之一,但由于学生对不等式知识的掌握和运用能力不强,没有把握好这种类型题目的正确解法,经常在高考中出现不必要失分。因此,研究含绝对值的不等式的解法具有重要的现实意义。一、公式法对于一些含绝对值的不等式也有一定的公式可以遵循。解绝对值不等式的关键是去绝对值,只要严格按照解含绝对值不 Inequality is one of the key contents of high school mathematics. However, due to the students’ ability of mastery and application of inequality knowledge is not strong, they do not grasp the correct solution of this type of topic, and often appear unnecessary loss points in college entrance examination. Therefore, studying the solution of inequality with absolute value has important practical significance. First, the formula method For some inequalities with absolute value there are certain formulas can be followed. The key to solving the absolute inequality is to go to absolute value, as long as the absolute value is not strictly in accordance with the solution