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函数的图像直接地反映了因变量随自变量的变化而变化的情况,然而,在有些函数的图像中,虽然自变量在某个时段不断变化,但其函数值却始终为一个定值(从函数的图像上看,此时段的图像是与x轴平行的)。这种情况单纯从图像上来看往往难以理解其中的蕴意,如若此时能将图像与实际生活联系起来,结合生活实际来诠释此时分段函数图像的蕴意,不但通俗易懂,还能让同学们感受到数学与生活的密切联系。
The image of the function directly reflects the fact that the dependent variable varies with the independent variable. However, in some images of the function, although the independent variable changes constantly in a certain period, the function value is always a fixed value Function of the image point of view, this period of the image is parallel with the x-axis). This situation simply from the image point of view is often difficult to understand the meaning of which, if the image can be associated with the actual life at this time, combined with the reality of life to interpret the meanings of segmentation function image at this time, not only easy to understand, but also Let students feel the close relationship between mathematics and life.