分段函数是高中代数中常见的函数 ,在《几何画板》中我们可以利用《几何画板》软件自带的函数ｓｇｎ( )来制作分段函数的图象 .例如我们要制作函数Ｆ(ｘ) =- 2ｘ - 122 + 1 ,ｘ∈ (ａ ,ｔ]- 2ｘ + 2 ,　　　ｘ∈ (ｔ,ｂ)的图象 ,可以按下述步骤来进行 :1 )选择【图表】莱单中的 Piecewise function is a common function in high school algebra. In “Geometry Sketchpad” we can use the function sgn( ) of “Geometry Sketchpad” software to make the image of piecewise function. For example, we want to make function F(x). =- 2x - 122 + 1, x∈ (a ,t]- 2x + 2 , x∈ (t,b) The image can be performed as follows: 1) Select the chart