如果抛物线y=-x2+2(m-1)x+m+1与x轴交于A、B两点,且点A在x轴的正半轴上,点B在x轴的负半轴上.OA长为a,OB长为b.(1)求m的取值范围;(2)若OA:OB=3:1,求m的值并写出此时抛物线的关系式;(3)设(2
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![如果抛物线y=-x2+2(m-1)x+m+1与x轴交于A、B两点,且点A在x轴的正半轴上,点B在x轴的负半轴上.OA长为a,OB长为b.(1)求m的取值范围;(2)若OA:OB=3:1,求m的值并写出此时抛物线的关系式;(3)设(2](/uploads/image/z/6624504-0-4.jpg?t=%E5%A6%82%E6%9E%9C%E6%8A%9B%E7%89%A9%E7%BA%BFy%3D-x2%2B2%28m-1%29x%2Bm%2B1%E4%B8%8Ex%E8%BD%B4%E4%BA%A4%E4%BA%8EA%E3%80%81B%E4%B8%A4%E7%82%B9%2C%E4%B8%94%E7%82%B9A%E5%9C%A8x%E8%BD%B4%E7%9A%84%E6%AD%A3%E5%8D%8A%E8%BD%B4%E4%B8%8A%2C%E7%82%B9B%E5%9C%A8x%E8%BD%B4%E7%9A%84%E8%B4%9F%E5%8D%8A%E8%BD%B4%E4%B8%8A.OA%E9%95%BF%E4%B8%BAa%2COB%E9%95%BF%E4%B8%BAb.%EF%BC%881%EF%BC%89%E6%B1%82m%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%EF%BC%9B%EF%BC%882%EF%BC%89%E8%8B%A5OA%3AOB%3D3%EF%BC%9A1%2C%E6%B1%82m%E7%9A%84%E5%80%BC%E5%B9%B6%E5%86%99%E5%87%BA%E6%AD%A4%E6%97%B6%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E5%85%B3%E7%B3%BB%E5%BC%8F%EF%BC%9B%EF%BC%883%EF%BC%89%E8%AE%BE%EF%BC%882)
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