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有的同学在解综合题中求点的坐标时只热衷于计算,却忽略了图形的作用。这样往往把能具体化的问题搞得抽象化,把可以从图形中寻找到的解题信息白白丢掉,使解题陷入困境。下面举例说明求点的坐标时,如何数形结合捕捉解题信息。 例1 一次函数图象交x轴于A(-6,0),交正比例函数图象于点B,且B点在第二象限,它的横坐标为-4,△AOB的面积为15(平
Some classmates are only keen on calculating while solving the coordinates of the point in solving the comprehensive problem, but they ignore the role of the graph. This often abstracts the problems that can be embodied, throw away the information that can be found in the graph, and make the problem difficult. The following example illustrates how to find the coordinates of the point, how to combine the number of shape capture problem solving information. Example 1 The image of the primary function crosses the x-axis to A(-6,0), the image of the positive proportional function is at point B, and the point B is in the second quadrant, its abscissa is -4, and the area of △AOB is 15 ( level