On solving inequality 1. Using reciprocity law skillfully to make unequal transformation-inequality has many properties and operation rules, such as symmetry, transitivity, additivity and so on. However, the flexible application of reciprocity rule has great advantages in solving problems, especially in inequality transformation. Law of reciprocity: If ab>0, then a>b and1a.

Equivalent to B. This law plays a very important role in proving or solving inequalities. Such as: (1998 college entrance examination questions adapted) solving the inequality loga( 1- 1

x)>； 1. Analysis: When a> is 1, the original inequality is equivalent to: 1- 1.

X>, namely 1.

x & lt 1-a，∫a & gt； 1,∴ 1-a<； 0, 1

X<0, so 1-a, 1.