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学习函数知识时,请同学们注意一个十分简单的关系:一个点如果在某函数的图象上,那么这个点的坐标满足函数的解析式,即把点的坐标代入解析式中,解析式左右两边相等.反之,一个点不在函数的图象上,这一点的坐标一定不满足解析式,利用这个关系,当知道函数图象上一个点的横坐标时,代入函数的解析式中可以求出它的纵坐标,当已知函数图象上一个点的纵坐标时,代入函数的解析式中可以求出它的横坐标,这些都是解题过程中最常用的方法.如用待定系数法求函数的解析式时,就是把点的坐
Learning function knowledge, students should pay attention to a very simple relationship: a point if the image in a function, then the coordinates of this point to meet the analytical function, that is, the point coordinates into analytical, analytic about On the contrary, a point is not on the function of the image, the coordinates of this point must not satisfy the analytical expression, using this relationship, when you know the abscissa of a point on the function image, into the analytic function can be obtained Its ordinate, when the ordinate of a point on the function image is known, can be found in the analytic formula of the function, which is the most commonly used method in solving the problem, such as using the method of undetermined coefficient Seeking the analytical function of the function, it is the point of the sit