已知抛物线y=x2+kx+b经过点P(2,-3),Q(-1,0).急急~~~~~~!已知抛物线y=x2+kx+b经过点P(2,-3),Q(-1,0).(1)求抛物线的解析式.(2)设抛物线顶点为N,与y轴交点为A.求sin∠AON的值.(3)设抛物线与x轴的另一个交点为M,求
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![已知抛物线y=x2+kx+b经过点P(2,-3),Q(-1,0).急急~~~~~~!已知抛物线y=x2+kx+b经过点P(2,-3),Q(-1,0).(1)求抛物线的解析式.(2)设抛物线顶点为N,与y轴交点为A.求sin∠AON的值.(3)设抛物线与x轴的另一个交点为M,求](/uploads/image/z/14058318-30-8.jpg?t=%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dx2%2Bkx%2Bb%E7%BB%8F%E8%BF%87%E7%82%B9P%282%2C-3%29%2CQ%28-1%2C0%29.%E6%80%A5%E6%80%A5%7E%7E%7E%7E%7E%7E%21%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dx2%2Bkx%2Bb%E7%BB%8F%E8%BF%87%E7%82%B9P%282%2C-3%29%2CQ%28-1%2C0%29.%281%29%E6%B1%82%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E8%A7%A3%E6%9E%90%E5%BC%8F.%282%29%E8%AE%BE%E6%8A%9B%E7%89%A9%E7%BA%BF%E9%A1%B6%E7%82%B9%E4%B8%BAN%2C%E4%B8%8Ey%E8%BD%B4%E4%BA%A4%E7%82%B9%E4%B8%BAA.%E6%B1%82sin%E2%88%A0AON%E7%9A%84%E5%80%BC.%283%29%E8%AE%BE%E6%8A%9B%E7%89%A9%E7%BA%BF%E4%B8%8Ex%E8%BD%B4%E7%9A%84%E5%8F%A6%E4%B8%80%E4%B8%AA%E4%BA%A4%E7%82%B9%E4%B8%BAM%2C%E6%B1%82)
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