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用判别式求一类函数式中参数取值范围之我见徐鸿迟（江苏省泰州中学２２５３００）在众多的数学书刊中，有时可以见到这样的求参数取值范围的问题：ｍ为何值时，函数ｙ＝ｘ２－２ｘ－３ｘ２＋２ｘ－ｍ的值域为全体实数？王和气在［１］中用判别式法作出了它的详细解答，大...
Using the Discriminant to Solve the Problem of the Range of Parameters in a Function Formula Xu Hongchi (Taizhou Middle School, Jiangsu Province, 225300) In many mathematics publications, we can sometimes see the problem of finding the range of values of parameters: The range of the function y=x2-2x-3x2+2x-m is all real numbers? Wang Heqi used the discriminant method in [1] to make its detailed answers....