在高中数学的学习中,导数知识一直是重难点。在导数内容考查的范围里,不等式问题因其与函数单调性、最值的完美结合,频繁成为高考的考查对象。不等式问题的本质其实是研究函数的变化情况及函数值的范围,高中生在日常学习过程中接触到的多是单变量的函数和不等式,但高考对不等式的考查却悄然从单变量转向了多变量,故学生在处理此类问题时常感到无从下手。事实上,含多变量的不等式往往考查的是消元思 In high school mathematics learning, derivative knowledge has always been a difficult task. In the scope of the test of the derivative content, the inequality problem frequently becomes the test object of the college entrance examination because of its perfect combination with the monotonicity of the function and the most value. In fact, the essence of the problem of inequality is to study the change of function and the scope of function value. Most of the high school students come into contact with the daily learning process are univariate functions and inequality, but the examination of inequality in the entrance exam has quietly shifted from univariate Variables, students often find it hard to deal with such problems. In fact, inequality with multivariate tests tend to eliminate conjecture