不等式问题千姿百态、五彩缤纷,其证明方法也不拘一格,妙招叠出.在我们所遇见的不等式中,时而有百思不得其解之经典题,时而为“问题中的等号取不到”而困惑、迷惘,更有“目标意识”不明朗而陷于山穷水尽时,…….当出现这些“症状”时,对我们学生而言,你不妨试用待定系数法,或许这一招能解你燃眉之急、还真够给力的.这不仅在数学学科的高考、竞赛中管用,而且在物理学中也占有一席之地.以下展示数例,权当抛砖引玉. Inequality problems are mixed, colorful, and its proof methods are also eclectic, coup stacked in the inequalities we meet, sometimes have puzzled classic questions, sometimes for the “equal sign in the problem can not get ”And confusion, confusion, more “ sense of purpose ”ambiguity and stuck in a dead end, ... ... When these “ Symptoms ”, for our students, you may wish to try undetermined coefficient method, perhaps this It is really enough to solve your pressing problems, which is not only used in college entrance examination and competition in mathematics, but also in physics.