已知直线y=2x+4与x轴、y轴分别交于A、D两点,抛物线y=-1/2x2+bx+c经过点A、D,点B是抛物线与x轴的另一个(1)求这条抛物线的解析式及点B的坐标.(2)设点M是直线AD上一点,且S△AOM:S△OMD=1:3,求点M的坐标
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![已知直线y=2x+4与x轴、y轴分别交于A、D两点,抛物线y=-1/2x2+bx+c经过点A、D,点B是抛物线与x轴的另一个(1)求这条抛物线的解析式及点B的坐标.(2)设点M是直线AD上一点,且S△AOM:S△OMD=1:3,求点M的坐标](/uploads/image/z/10320462-54-2.jpg?t=%E5%B7%B2%E7%9F%A5%E7%9B%B4%E7%BA%BFy%3D2x%2B4%E4%B8%8Ex%E8%BD%B4%E3%80%81y%E8%BD%B4%E5%88%86%E5%88%AB%E4%BA%A4%E4%BA%8EA%E3%80%81D%E4%B8%A4%E7%82%B9%2C%E6%8A%9B%E7%89%A9%E7%BA%BFy%3D-1%2F2x2%2Bbx%2Bc%E7%BB%8F%E8%BF%87%E7%82%B9A%E3%80%81D%2C%E7%82%B9B%E6%98%AF%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%281%29%E6%B1%82%E8%BF%99%E6%9D%A1%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E8%A7%A3%E6%9E%90%E5%BC%8F%E5%8F%8A%E7%82%B9B%E7%9A%84%E5%9D%90%E6%A0%87.%282%29%E8%AE%BE%E7%82%B9M%E6%98%AF%E7%9B%B4%E7%BA%BFAD%E4%B8%8A%E4%B8%80%E7%82%B9%2C%E4%B8%94S%E2%96%B3AOM%EF%BC%9AS%E2%96%B3OMD%3D1%3A3%2C%E6%B1%82%E7%82%B9M%E7%9A%84%E5%9D%90%E6%A0%87)
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