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【简答题】
如图所示，已知抛物线y=ax 2 +bx+c过点A（-1，0），且经过直线y=x-3与坐标轴的两个交点B、C． （1）求抛物线的表达式； （2）若点M在第四象限内且在抛物线上，有OM⊥BC，垂足为D，求点M的坐标．
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B.
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