已知抛物线y=ax2+bx+c的图象如图所示，则下列结论：①abc＞0；②a+b+c=2；③a＜12；④b＞1．其中正确的结论是_刷题宝

题干

已知抛物线y=ax²+bx+c的图象如图所示，则下列结论：①abc＞0；②a+b+c=2；③a＜

1

2

；④b＞1．其中正确的结论是（　　）

A：①②

B：②③

C：③④

D：②④

上一题下一题 0.0难度选择题更新时间:2016-07-14 09:08:45

答案(点此获取答案解析）

D

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①束手无策②巉岩③吹毛求疵

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A：____

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B：____

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F. Because his music is exciting.

G. I think it's amazing.

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