几何换元三角 ,方程综合单调 ,判别有界配方 .因题而异 ,求值域在归纳注 :“几何”指数形结合 ,即用几何的思想求解 ;“换元”指换元法 ,“三角”指三角代换 ;“方程”指利用方程的思想 ,即反函数法 ;“综合”指综合分析法 ;“单调”指利用函数的单调性 ;“判别”指判别式法 ; Geometry triangles, equations monotonous, discriminant bounded formulas. Due to different questions, the evaluation domain is inductive Note: “Geometric” exponential combination, that is, the use of geometric ideas; “Change yuan” refers to the replacement method, “ ”Triangle“ refers to trigonometric substitution; ”equation“ refers to the idea of ​​using equations, ie, inverse function method; ”integration“ refers to comprehensive analysis; ”monotony“ refers to the monotonicity of functions; ”discrimination" refers to discriminant methods;