分类讨论是“化整为零,各个击破,再积零为整”的数学策略.分类讨论的基本原则是:不重不漏,科学合理.高考数学将分类与整合思想的考查放在了比较重要的位置,考查的主要题型是含字母参数的数学问题.分类讨论的角度很多,下面以引发分类讨论的不同角度进行分类解析.1.由数学概念引起的分类讨论.如绝对值的定义、二次函数的定义、直线与平面所成的角、直线的倾斜角等.例1函数f(x)=ax2+4x-3在x∈[0,2]上有最大值 The classification discussion is a mathematical strategy of “classification is zero, each break, then zero for the whole ” The basic principles of classification are: not overdoes, scientific and reasonable.Case mathematics classification and integration of the test on The more important position to examine the main problem is to test the mathematical problems with alphabetic parameters.Classification of the discussion of many, the following classification and analysis to trigger the classification of different perspectives .1 classification caused by mathematical concepts such as absolute value Definition of quadratic function, angle between line and plane, angle of inclination of line, etc. Example 1 The function f (x) = ax2 + 4x-3 has the maximum value on x∈ [0,2]