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与相等现象相比,不等现象在现实世界中更为普遍,如地球上海洋面积大于陆地面积,铅球的质量比篮球的质量大……而不等式是刻画不等现象的有力模型.一、基础知识不等式的基本性质:1.不等式的两边都加上(或减去)同一个整式,不等号的方向不变.2.不等式的两边都乘以(或除以)同一个正整,不等号的方向不变.3.不等式的两边都乘以(或除以)同一个负数,不等
Compared with equal phenomena, inequalities are more common in the real world. For example, the ocean area on the earth is larger than the land area, and the quality of shot put is higher than that of basketball ... Inequality is a powerful model to describe unequal phenomena. The basic properties of knowledge inequalities: 1. Inequality add (or subtract) the same integral on both sides of the inequality of the same direction .2. Both sides of the inequality multiplied by (or divided by) the same positive integer, the direction of the inequality Unchanged .3. Both sides of the inequality are multiplied by (or divided by) the same negative number