新教材对于某些高次不等式和分式不等式采取分类讨论的解法 ,使同学们重温集合的有关知识 ,培养我们具有严密的逻辑思维能力 ,具有现实意义 .不过如果从解决问题的角度来看 ,列表法更容易掌握并且一目了然 .例 1　求 f(x) =x(x -3 ) (x + 1) (x -2 )0的解集 .解　找零点 -1,0 The new textbook adopts a class-discussion solution for certain high-order inequalities and fractional inequalities, which enables students to revisit the relevant knowledge of the collection and cultivate our ability to have strict logical thinking, which is of practical significance. However, if we look at the problem-solving perspective, The list method is easier to grasp and clear at a glance. Example 1 Find the solution set of f(x) = x(x -3) (x + 1) (x -2) 0. Find the zero point -1,0