近年来,中考题中出现了一些以二次函数图象为已知条件的选择题.对这类问题需要我们从二次函数图像中提取信息从而得出正确结论.那么怎样才能快速获得有效信息呢?我们可以从以下几个方面考虑. In recent years, there have been some multiple choice questions in the senior high school entrance examination questions that are based on the quadratic function image as the known condition. For such problems, we need to extract the information from the quadratic function image to get the correct conclusion. So how can we get effective information quickly We can consider from the following aspects.