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二元表达式是指含有两个变量的表达式,通常记为f(x,y),有关二元表达式的值域、最值问题是近几年高考中的常考题型.题型的一般表述:已知f(x,y)=c(c是常数),求g(x,y)的范围或最值等.常见的处理方法:1把二元函数问题转化为一元函数问题求解把二元函数问题转化为一元函数问题的解题思路为:⑴利用f(x,y)=c求出x的可取范围D_x;
Binary expression is an expression containing two variables, usually denoted by f (x, y), the binary expression of the value range, the most value problem is the college entrance examination in recent years, the usual test questions. General Description: Known f (x, y) = c (c is a constant), g (x, y) of the range or the most value, etc. Common treatment: 1 binary function problem is converted to a one-dollar function problem solving The solution to the problem of converting a binary function problem into a unary function problem is: (1) using f (x, y) = c to find the desirable range D of x;