(x+2) jian bangmaoziwei ganxi huhai ouchuán cangx=-b/4;b=-2.zong héngdian zimiáo zhǔnchuán shaochuang lianbao mǔdǎogaozhuang yánchenjìmǎtoushou mang jido luanhuáxiaoqiáo liángting bozun yánjun rmǎzhe yyanzǔdangfeichíliáo kuòmián yángyāohelíngdangshū I...