如图,平行四边形ABCD的顶点A(-12,0),B(0,9),C(0,21/4),抛物线y=ax^2+bx+c经过点A、B.(1)D点坐标⑵关于x的方程ax2+bx+c-(21/4)=(3x/4)有且只有一个解,求抛物线解析式.⑶在⑵的条件下点,P为抛物线上y=ax2+bx+c一
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![如图,平行四边形ABCD的顶点A(-12,0),B(0,9),C(0,21/4),抛物线y=ax^2+bx+c经过点A、B.(1)D点坐标⑵关于x的方程ax2+bx+c-(21/4)=(3x/4)有且只有一个解,求抛物线解析式.⑶在⑵的条件下点,P为抛物线上y=ax2+bx+c一](/uploads/image/z/4042209-57-9.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E7%9A%84%E9%A1%B6%E7%82%B9A%28-12%2C0%29%2CB%280%2C9%29%2CC%280%2C21%2F4%29%2C%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dax%5E2%2Bbx%2Bc%E7%BB%8F%E8%BF%87%E7%82%B9A%E3%80%81B.%281%29D%E7%82%B9%E5%9D%90%E6%A0%87%E2%91%B5%E5%85%B3%E4%BA%8Ex%E7%9A%84%E6%96%B9%E7%A8%8Bax2%2Bbx%2Bc-%2821%2F4%29%3D%283x%2F4%29%E6%9C%89%E4%B8%94%E5%8F%AA%E6%9C%89%E4%B8%80%E4%B8%AA%E8%A7%A3%2C%E6%B1%82%E6%8A%9B%E7%89%A9%E7%BA%BF%E8%A7%A3%E6%9E%90%E5%BC%8F%EF%BC%8E%E2%91%B6%E5%9C%A8%E2%91%B5%E7%9A%84%E6%9D%A1%E4%BB%B6%E4%B8%8B%E7%82%B9%2CP%E4%B8%BA%E6%8A%9B%E7%89%A9%E7%BA%BF%E4%B8%8Ay%3Dax2%2Bbx%2Bc%E4%B8%80)
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