现实生活中的不等关系处处存在.掌握好不等式基本性质和一元一次不等式(组)的解题方略,可为今后进一步学习打下牢固的基础.1.不等式基本性质对不等号方向的确定例1判断下列结论是否正确:①如果a>b,那么a-3>b-3.②如果a>b,那么a-x>b-x.③如果a>b,那么3a>3b.④如果a>b,那么ax>bx.⑤如果a>b,那么a|x|>b|x|.⑥如果a|x|>b|x|,那么a>b. The inequality in real life exists everywhere. To master the basic properties of the inequality and solve the problem of a one-time inequality (group) can lay a solid foundation for further study in the future. 1. The basic properties of inequalities determine the direction of inequality 1. Whether the following conclusions are correct: 1 If a>b, then a-3>b-3.2 If a>b, then ax>bx.3 If a>b, then 3a>3b.4 If a>b, then ax > bx.5 If a>b, then a|x|>b|x|.6 If a|x|>b|x|, then a>b.