考点1不等式的基本性质、解集的概念[知识要点]1·不等式的基本性质:(1)若ab,则a±cb±c;(2)若ab,c0,则acbc,cacb;(3)若ab,c0,则acbc,cacb.2·能使不等式成立的未知数的值叫做不等式的;不等式所有解的集合叫做这个不等式的.3·不等式组的解集是不等式组中每个不等式的解集 The basic properties of test point 1 inequality and the concept of solution set [Knowledge points] 1. The basic properties of inequality: (1) If ab, then a ± cb ± c; (2) If ab, c0, then acbc, cacb; (3 If ab,c0, then acbc,cacb.2·The value of the unknown that holds the inequality is called inequality; the set of all solutions of inequality is called the inequality. The solution set of inequality group is the inequality of each inequality group. Solution Set