如果己知函数y=f(x)的图象,我们可以通过有关的变换而得到一系列函数的图象。下面用具体例子加以说明。一、简单变化 1.y=-f(x) 因为-f(x)与f(x)互为相反数,所以函数y=-f(x)的图象与y=f(x)的图象关于x轴对称。故只要把y=f(x)的图象关于x轴反射,就可以得到y=-f(x)的图象。 If we know the image of the function y=f(x), we can get a series of images of the function through the relevant transformations. The following uses specific examples to illustrate. First, a simple change 1. y =-f (x) Because -f (x) and f (x) are inverse numbers, so the function y = -f (x) of the image and y = f (x) of the graph Like about the x-axis symmetry. Therefore, as long as the image of y=f(x) is reflected about the x-axis, an image of y=-f(x) can be obtained.