28.已知二次函数y=x2 Bx C与x轴交于a两点 1求这个二次函数的关系式 2若有一半径为r的⊙p且圆心p在抛物线上运动当 Template




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tomski28.已知二次函数y=x2 bx c与x轴交于a两点 coloring