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一、平移规律呈现人教版七年级数学下册,在“平面直角坐标系”一章“用坐标表示平移”这节内容中,总结归纳了图形平移时图形上各点坐标变化规律:①在平面直角坐标系中,将点(x,y)向右(或向左)平移a个单位长度,可以得到对应点(x+a,y)(或(xa,y));将点(x,y)向上(或向下)平移b个单位长度,可以得到对应点(x,y+b)(或(x,y-b));②对一个图形平移,这个图形上所有点坐标都要发生相应变化;反过来,从图形上点的坐标的某种变化,可以看出对这个图形进行了怎样的平移.
First, the law of translation shows PEP mathematics books in the seventh grade, in the “plane Cartesian coordinate system ” chapter “in the coordinate translation” in this section, summarizes the graphics shift coordinates of each point on the graph changes Regularity: (1) In plane Cartesian coordinate system, the point (x, y) is translated to the right (or left) by a unit length to get the corresponding point (x + a, y) (X, y + b) (or (x, yb)) by translating the point (x, y) upwards (or downwards) by b units of length; (2) For a graphic translation, all points on the graph Coordinates have to change accordingly; in turn, some change in the coordinates of the point on the graph shows how the translation of the graph was made.