已知直线y=1/2x+7/2与x轴、y轴分别相交于B、A两点,抛物线y=ax²+bx+c经过A、B两点,且对称(1)求A,B两点的坐标和抛物线解析式(2)若点P以1个单位每秒的速度从点B沿x轴向点O运动.过点P作y轴的
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![已知直线y=1/2x+7/2与x轴、y轴分别相交于B、A两点,抛物线y=ax²+bx+c经过A、B两点,且对称(1)求A,B两点的坐标和抛物线解析式(2)若点P以1个单位每秒的速度从点B沿x轴向点O运动.过点P作y轴的](/uploads/image/z/5410224-0-4.jpg?t=%E5%B7%B2%E7%9F%A5%E7%9B%B4%E7%BA%BFy%3D1%2F2x%2B7%2F2%E4%B8%8Ex%E8%BD%B4%E3%80%81y%E8%BD%B4%E5%88%86%E5%88%AB%E7%9B%B8%E4%BA%A4%E4%BA%8EB%E3%80%81A%E4%B8%A4%E7%82%B9%2C%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dax%26sup2%3B%2Bbx%2Bc%E7%BB%8F%E8%BF%87A%E3%80%81B%E4%B8%A4%E7%82%B9%2C%E4%B8%94%E5%AF%B9%E7%A7%B0%EF%BC%881%EF%BC%89%E6%B1%82A%2CB%E4%B8%A4%E7%82%B9%E7%9A%84%E5%9D%90%E6%A0%87%E5%92%8C%E6%8A%9B%E7%89%A9%E7%BA%BF%E8%A7%A3%E6%9E%90%E5%BC%8F%EF%BC%882%EF%BC%89%E8%8B%A5%E7%82%B9P%E4%BB%A51%E4%B8%AA%E5%8D%95%E4%BD%8D%E6%AF%8F%E7%A7%92%E7%9A%84%E9%80%9F%E5%BA%A6%E4%BB%8E%E7%82%B9B%E6%B2%BFx%E8%BD%B4%E5%90%91%E7%82%B9O%E8%BF%90%E5%8A%A8.%E8%BF%87%E7%82%B9P%E4%BD%9Cy%E8%BD%B4%E7%9A%84)
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