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A

d

B

B

B

600 mm两种，按照生产的要求，600 mm钢管的数量不能超

(1)截得两种钢管的总长度不能超过4000 mm；

(2)截得600 mm钢管的数量不能超过500 mm钢管数量的3倍；

(3)截得两种钢管的数量都不能为负。

(1) a>b b<a要求同时满足上述三个不等关系，可以用下面的不（对称性）

(2) a>b，b>c a>c（传递性）

(3) a>b a＋c>b＋c（加法不变性）

(4) a>b，c>0 ac>bc；

a>b，c<0 ac<bc（乘法单调性）

(1) a>b要求同时满足上述三个不等关系，可以用下面的不，c>d a＋c>b＋d;

(2) a>b>0，c>d>0， ac>bd;

(3) a>b>0，n∈N*，n>1 an>bn ;

1、生活中的不等关系以及不等关系的应用；

2、不等式的基本性质以及推论。