证明绝对值不等式(包括实数的绝对值比较大小),固然可以运用通常的方法,如比较法、综合法、逆证法,放缩法、数学归纳法、求导数法等等,但是由于不等式中含有绝对值记号,往往给使用某些公式带来不便;不过,正因为不等式中含绝对值记号,又给采用一些特殊的技巧创造条件,本文就此作一点讨论。一、运用绝对值概念,去掉(或添上)绝对值记号。 To prove the absolute value inequality (including the absolute value of the absolute value of the real number), although you can use the usual methods, such as comparison, synthesis, contradiction, contraction, mathematical induction, derivative method, and so on, but because of inequality Containing absolute value notation often brings inconvenience to the use of certain formulas; however, because the inequality contains absolute value notation, it also creates conditions for the use of some special techniques. This article discusses this point. First, use the concept of absolute value, remove (or add) the absolute value mark.