1.本单元知识网络2.重点、难点、热点分析1)重点:集合及子集、交集、并集、补集、空集、相等集合等概念的理解,元素与集合、集合与集合之间的关系及集合的运算的理解与应用;绝对值不等式、一元二次不等式的解法,二次不等式、二次方程和二次函数之间的联系与应用;逻辑联结词“且 1. The Unit Knowledge Network 2. Highlights, Difficulties, Hot Spot Analysis 1) Focus: Understanding of concepts such as sets and subsets, intersections, unions, complements, empty sets, equal sets, elements and sets, sets and sets The understanding and application of the relations and sets of operations; the solutions of absolute value inequalities, unary quadratic inequalities, quadratic inequalities, quadratic equations, and quadratic functions; logical conjunctions