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以xi(i=1,2,…,n)为变量的基本初等函数,经过有限次的四则运算或复合运算,且可用一个式子表示的函数y=f(x1,x2,…,xn)称为多元初等函数.近年来各地高考屡屡以多元函数模型为载体,综合考查函数的单调性、函数的最值、导数及其应用等基础知识,着力考查推理论证能力、运算求解能力、知识交汇迁移能力和创新意识等,有效考查函数与方程、化归与转化、分类与整合、数形结合等数学思想.这对以一元
Basic elementary functions with xi(i=1,2,...,n) as variables, after a limited number of four operations or compound operations, and functions that can be represented by one formula y=f(x1,x2,...,xn) It is called multivariate elementary function. In recent years, college entrance examinations have repeatedly used multivariate function model as the carrier to comprehensively examine the monotony of function, the function’s maximum value, derivative, and its application, etc., and strive to examine the ability of inference theory, calculation and solving ability, and knowledge exchange. Migration ability and innovation consciousness, etc. Effectively examine mathematics such as functions and equations, transformation and transformation, classification and integration, and combination of number and shape.