二次函数图像与系数的关系，中考必考题型，难度系数四星半
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已知二次函数y＝ax2＋bx＋c的图像如图所示，下列结论：①abc＞0；②2a－b＜0；③4a－2b＋c＜0；④(a＋c)2＜b2. 其中正确的个数是( )
A．1 B．2 C．3 D．4
A．1 B．2 C．3 D．4
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