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中学数学里函数图象的变换主要有:平移、对称和伸缩.本文着重介绍平移. 平移变换有如下两种. (1)水平方向的平移:y=f(x±a)(a>0)的图象,可由y=f(x)的图象向左(+)或向右(-)平移a个单位而得到. (2)竖直方向的平移:y=f(x)±b(b>0)的图象,可由y=f(x)的图象向上(+)或向下(-)平移6个单位而得到.
The transformation of function images in middle school mathematics mainly includes: translation, symmetry and scaling. This article focuses on translation. There are two kinds of translational transformations. (1) Horizontal translation: y=f(x±a) (a>0) The image can be obtained by shifting the image of y=f(x) by a left (+) or right (-) position by a unit. (2) Vertical translation: y=f(x)±b ( The image of b>0) can be obtained by shifting the image of y=f(x) up (+) or down (-) by 6 units.