如图,在平面直角坐标系中,抛物线y1=a[x-1]的平方-a与x轴交于O,A两点,顶点为M,对称轴交抛物线y2=[4-a]x的平方于点.连接OB,AB,OM,AM.已知0<a<4,四边形OMAB的面积为S将抛物线y1=a[x-1]的平方-a改为y=a(x-
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![如图,在平面直角坐标系中,抛物线y1=a[x-1]的平方-a与x轴交于O,A两点,顶点为M,对称轴交抛物线y2=[4-a]x的平方于点.连接OB,AB,OM,AM.已知0<a<4,四边形OMAB的面积为S将抛物线y1=a[x-1]的平方-a改为y=a(x-](/uploads/image/z/6967470-30-0.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E5%B9%B3%E9%9D%A2%E7%9B%B4%E8%A7%92%E5%9D%90%E6%A0%87%E7%B3%BB%E4%B8%AD%2C%E6%8A%9B%E7%89%A9%E7%BA%BFy1%3Da%5Bx-1%5D%E7%9A%84%E5%B9%B3%E6%96%B9-a%E4%B8%8Ex%E8%BD%B4%E4%BA%A4%E4%BA%8EO%2CA%E4%B8%A4%E7%82%B9%2C%E9%A1%B6%E7%82%B9%E4%B8%BAM%2C%E5%AF%B9%E7%A7%B0%E8%BD%B4%E4%BA%A4%E6%8A%9B%E7%89%A9%E7%BA%BFy2%3D%5B4-a%5Dx%E7%9A%84%E5%B9%B3%E6%96%B9%E4%BA%8E%E7%82%B9.%E8%BF%9E%E6%8E%A5OB%2CAB%2COM%2CAM.%E5%B7%B2%E7%9F%A50%EF%BC%9Ca%EF%BC%9C4%2C%E5%9B%9B%E8%BE%B9%E5%BD%A2OMAB%E7%9A%84%E9%9D%A2%E7%A7%AF%E4%B8%BAS%E5%B0%86%E6%8A%9B%E7%89%A9%E7%BA%BFy1%3Da%5Bx-1%5D%E7%9A%84%E5%B9%B3%E6%96%B9-a%E6%94%B9%E4%B8%BAy%3Da%EF%BC%88x-)
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