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在高考试题中,线性规划是高频考点,这类问题有两个难点:一是目标函数非线性;二是求线性规划问题中参数的取值范围.本文就第一类问题目标函数非线性,其最值的求法进行分类解析.一、斜率型例1已知实数x,y满足不等式{2x-y≥0,x+y-4≥0,x≤3,则2x~3+y~3/x~2y的取值范围是____.解2x~3+y~3/x~2y=2·x/y+(y/x)~2.令k=
In the college entrance examination test, the linear programming is a high-frequency test center, there are two difficulties in this type of problem: one is the objective function nonlinear; the other is to find the range of parameters in the linear programming problem.In this paper, , The value of the method for classification analysis.A slope type example 1 known real number x, y satisfy the inequality {2x-y≥0, x + y-4≥0, x≤3, then 2x ~ 3 + y ~ The range of 3 / x ~ 2y is ____. Solution 2x ~ 3 + y ~ 3 / x ~ 2y = 2 · x / y + (y / x)