抛物线y=-x^2+2(m+1)x+m+3与x轴交于A,B两点,且OA:OB=3:1,则m等于( )A、5/3 B、0 C、-5/3 或 0 D、1有图,抛物线顶点在第一象限,开口向下,A、B两点在y轴两侧,左B右A,OA大于OB.
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![抛物线y=-x^2+2(m+1)x+m+3与x轴交于A,B两点,且OA:OB=3:1,则m等于( )A、5/3 B、0 C、-5/3 或 0 D、1有图,抛物线顶点在第一象限,开口向下,A、B两点在y轴两侧,左B右A,OA大于OB.](/uploads/image/z/700936-16-6.jpg?t=%E6%8A%9B%E7%89%A9%E7%BA%BFy%3D-x%5E2%2B2%28m%2B1%29x%2Bm%2B3%E4%B8%8Ex%E8%BD%B4%E4%BA%A4%E4%BA%8EA%2CB%E4%B8%A4%E7%82%B9%2C%E4%B8%94OA%EF%BC%9AOB%3D3%EF%BC%9A1%2C%E5%88%99m%E7%AD%89%E4%BA%8E%EF%BC%88+%EF%BC%89A%E3%80%815%2F3+B%E3%80%810+C%E3%80%81-5%2F3+%E6%88%96+0+D%E3%80%811%E6%9C%89%E5%9B%BE%2C%E6%8A%9B%E7%89%A9%E7%BA%BF%E9%A1%B6%E7%82%B9%E5%9C%A8%E7%AC%AC%E4%B8%80%E8%B1%A1%E9%99%90%2C%E5%BC%80%E5%8F%A3%E5%90%91%E4%B8%8B%2CA%E3%80%81B%E4%B8%A4%E7%82%B9%E5%9C%A8y%E8%BD%B4%E4%B8%A4%E4%BE%A7%2C%E5%B7%A6B%E5%8F%B3A%2COA%E5%A4%A7%E4%BA%8EOB.)
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