Construction method is an important method to compare the size of numbers and equations.Com-mon construction methods include constructing graphs and constructing functions and inequalities.Several common methods are introduced with examples,focusing on the constructor method.Constructive function method is divided into the use of isomorphisms to construct functions,the use of equivalence relations to compare the size,the use of difference quotient formula to construct functions and constant value permutation constructive function,according to the concavity and convexity of the constructive function and the use of inequality characteristics to construct func-tions and other methods.
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