写作的过程其实也是思考的过程,下面看看曾文怡同学的这篇习作.例求a/(|a|)+b/(|b|)+c/(|c|)的值(a、b、c是非零有理数).在学习有理数时,我发现:若a大于0,即a是正数,则a/|a|=1;若a小于0,即a是负数,则a/(|a|)=-1.也就是说,a/(|a|)、b/(|b|)和c/(|c|)的值与a、b、c的正负有关,因此可分以下四种情况进行讨论.情况一:当a、b、c同时为正数,即a>0,b>0, The process of writing is actually the process of thinking, let’s take a look at this exercise of the classmate Zeng Wenyi Example (a, b) (a) + b / (| b |) + c / , C is a non-zero rational number.) When learning rational numbers, I found that a / | a | = 1 if a is greater than 0, that is, a is a positive number; That is, the values ​​of a / (| a |), b / (| b |) and c / (| c |) are related to the positive and negative of a, b, c, Four cases are discussed: Case 1: when a, b, c are positive numbers at the same time, that is, a> 0, b> 0,