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解含有参数的不等式时,要按照一定的顺序对参数进行讨论,才能不会遗漏且一目了然．一般是由简到繁,按照字母在所给数域中的取值大小依次进行讨论．
When solving inequalities that contain parameters, parameters must be discussed in a certain order so that they are not missed and can be seen at a glance. It is generally from simple to complex, according to the value of the letter in the given number field in order to discuss.