一、数形结合思想在函数解题中的应用函数是高中数学的重要内容之一,通过把“数”和“形”结合起来,利用函数图像研究函数的性质,由函数的解析式画出几何图形,由此相互依托.例1求函数y=(1-x~2)~(1/2)/(2+x)的值域.分析由题意易知定义域是-1≤x≤1,所以可设x=cosθ(0≤θ≤π),则有y= First, the combination of the idea of ​​the number and shape in the function problem solving function is one of the important content of high school mathematics. Through the combination of “number ” and “shape ”, the use of function images to study the nature of the function, Analytic formula draw geometry, which depend on each other .Example 1 seeking function y = (1-x ~ 2) ~ (1/2) / (2 + x) of the value range. -1 ≤ x ≤ 1, so x = cos θ (0 ≤ θ ≤ π), then y =