已知二次函数y=ax²+bx+c的图像过A(1,0),B(2,0),与y轴交于C1）求二次函数解析式2）设△ABC的外接圆的圆心为M,求点M的坐标3）点D（x1,y1）在抛物线上,0＜x1＜2,过D做、作DD1⊥x轴,D1为垂足,如果△BDD

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