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中考必刷二次函数压轴，你吭哧吭哧算的时候，学霸仅仅轻瞄了一眼
二次函数图像性质及与一元二次方程根的对应关系
中考真题详解18/29
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![芷江县气象局发布霾黄色预警[Ⅲ级/较重]](http://p26-sign.bdxiguaimg.com/tos-cn-p-0015/osADQIbQOBsfvftVAGCvDoK8LD4IEQe7iBPDx2~tplv-pk90l89vgd-fglass:864:486:90.jpeg?appId=32&biz_tag=list_custom%2Fnone&channelId=0&customType=custom%2Fnone&from=101_middle_image&imageType=list&isImmersiveScene=0&is_stream=0&lk3s=9d3f5bff&logId=20250107214027D0196DAC9CFB1271ABE9&requestFrom=101&x-expires=1767793228&x-signature=JfM8Kn%2BOAWHcWUYJd67jM%2FVPWxk%3D)
