已知：当x=2时,抛物线y=ax²+bx+c取得最小值-1,并且抛物线与y轴交于点C（0,3）,与X轴交于点A、B（1）求该抛物线的关系式（2）若点M（x,y1),N(x+1,y2),都在该抛物线上,试比较y1与y2的大小（3）D是

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