已知二次函数y=ax2+bx+c(a≠0)的图象如图所示,则下列6个结论正确的有________ 个.
①ac<0;②2a+b=0;③4a+2b+c>0;④对于任意x均有ax2+bx≥a+b;⑤3a+c=0;⑥b+2c<0;⑦当x>1时,y随着x的增大而减小
①ac<0;②2a+b=0;③4a+2b+c>0;④对于任意x均有ax2+bx≥a+b;⑤3a+c=0;⑥b+2c<0;⑦当x>1时,y随着x的增大而减小
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/27/ed518fa9-bd0f-4051-91c9-62e8a0abc10e.png?resizew=177)
更新时间:2017-04-07 19:25:32
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