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在不等式学习中,经常会遇到|x-x1|±|x-x2|1)有解、无解、解是一切实数,在某区间上存在解、在某区间上恒成立等一些相似、相反、相关的问题.对以上这些问题.往往教者难以说清,学者容易混淆.下面通过实例加以辨析.
In inequality learning, it is often encountered that |x-x1|±|x-x2|1) has solutions, no solutions, solutions are all real numbers, there are solutions in some interval, and the interval is constant in some interval. Some similar, contrary, related issues have been set up. For these problems, it is often difficult for scholars to clarify and scholars are confusing.