In mathematics, the integral of a function of several variables defined on a line or curve that has been expressed in terms of arc length .
数学中，定义在直线或曲线（已经表示为许多段弧长）上的多元函数的积分。Well, hopefully you kind of vaguely remember that it was about functions of several variables and their partial derivatives.
希望你们大致记得，这是关于多元函数及其偏导的。Test solutions illustrate that the presented algorithm is efficient for both one-variable functions and multi-variable functions.
实验测试结果表明，该算法对一元函数优化和多元函数优化都有很好的效果。The differential calculus of the pluralistic function is both the key and difficult point in higher mathematics.
多元函数微分学是高等数学教学的重点和难点之一。The teaching of function of several variables is a difficult point in higher mathematics teaching.
多元函数的教学是高等数学教学中的一个难点。It is simple and easy rather than difficult to use the mathematical idea of transformation in studying calculus of poly-function.
把转化数学思想运用到多元函数的微积分学中，使看似非常复杂的问题变得简单易学。Methods: Multivariate complete incremental factorial analysis is used.
方法：运用多元函数全增量因素分析法。multi-function continuity, partial derivatives exist and the concept of micro-and the relationship between;
多元函数连续、偏导数存在和可微的概念及三者之间的关系；multi-function limits and continuous, differential and its application, re-integration, the curve integral, surface integral;
多元函数的极限与连续、微分及其应用，重积分，曲线积分，曲面积分；