在高中数学线性规划一章中,我们知道二元一次不等式的解集实际上就是该二元一次方程所对应直线某侧区域上所有点的集合,数形结合的思想要求我们用图解法来表示区域,这里就有一个快速判断线性区域的问题,我在这里想介绍一种快速判断的方法,以利于快速成图。结论 1:二元一次不等式两边同时乘以-1,所对应区域是一致的。 In the chapter of Mathematical Linear Programming of Senior High School, we know that the solution set of the dual inequality is actually the set of all the points on one side of the line corresponding to the binary equation. The idea of ​​the combination of numbers requires us to use the graphic method to represent Region, there is a quick question here to determine the linear region, I would like to introduce here a quick way to judge, in order to facilitate rapid mapping. Conclusion 1: Binary inequality both sides multiplied by -1 at the same time, the corresponding area is consistent.