已知二次函数y=ax2+bx+c的图象如图所示,有以下结论:①a+b+c

已知二次函数yax2bxc的图象如图所示,有以下结论:①abc0;②ab c1;③abc0;④4a2bc0;⑤ca1,其中所有

正确结论的序号是(     

A①②③               B①③④       

C①②③             D①②③④⑤

 


答案

C

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