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一、定义域为R的二次分式函数用“判别式”法解题步骤1.把函数转化为关于x的二次方程;2.方程有实根,Δ≥0;3.求得函数值域.
1. The quadratic fractional function with domain R is solved by the “discriminant method” step 1. The function is converted into a quadratic equation about x; 2. The equation has a real root, Δ ≥ 0; Get function value field.