www.mqpf.net > 如图,抛物线y=%x^2/2+mx+n与x轴交于A,B两点,与y轴交于点C,抛物线的对称轴交x

如图,抛物线y=%x^2/2+mx+n与x轴交于A,B两点,与y轴交于点C,抛物线的对称轴交x

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