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任何事物的内部都存在着矛盾,而矛盾的双方在一定条件下可以相互转化．在不等式的解集中,解集的端点值来自相应方程的解和定义域．下面举例说明不等式与方程之间的这种辩证关系在解客观题中的应用．
There are contradictions in the interior of any thing, and the contradictory parties can transform each other under certain conditions. In the solution set of inequality, the endpoint values of the solution set come from the solution and definition fields of the corresponding equations. The following examples illustrate the application of this dialectical relationship between inequalities and equations in solving objective problems.