高考试题多数都是在知识的交汇点处命题,而不等式问题恰好是知识交汇点的最好载体之一。在解决不等式问题中,经常含有“任意”与“存在”等词,因对这两个词理解不透,同学们往往用尽了洪荒之力,也不得其解。下面通过几例及变式(即题组)对这两个概念进行深入探析,希望起到抛砖引玉的作用,解除你的烦恼。一、“任意”、“存在”仅含一个 Most of the college entrance examination questions are propositions at the intersection of knowledge, and inequality problem is just one of the best carriers of knowledge convergence point. In solving the inequality, often contain “any ” and “exist ” and other words, because these two words are not understood, students often use up the power of the prehistoric, but also puzzled. The following several examples and variants (that is, the title group) in-depth analysis of these two concepts, hoping to play a valuable role, relieve your troubles. One, “Any ”, “Existence ” contains only one