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多变量范围问题,一直以来都是各地高考及模拟考试的热点问题.这类问题由于变量多且变量之间存在纷繁复杂的约束关系,处理起来往往是顾此失彼,难以入手,常令学生望而生畏.倘若能把多维(变量)降为二维甚至一维,那么问题自然就“删繁就简,拨云见日”了.以下是多变量范围问题降维处理的常见手段.
The problem of multivariable range has always been a hot issue in entrance examinations and mock examinations all over the world.Due to the large number of variables and the complicated and complicated relationship between variables, these problems are often overlooked and difficult for students to start with and often make students daunting Multi-dimensional (variable) can be reduced to two-dimensional or even one-dimensional, then the problem naturally “delete the simple, dial the cloud to see the day.” The following is a common means of dimensionality reduction multivariate processing.