矩形ABCD中,AB=2,AD=1边AB,AD分别在x轴的,y轴的正半轴上,点A与原点重合,一次函数y=-1/2x+b的图像分别交y轴,x轴于点E,F,当矩形ABCD沿直线y=-1/2+b折叠时,点A落在DC上的A╰处,求点A╰处的坐标和b的值
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![矩形ABCD中,AB=2,AD=1边AB,AD分别在x轴的,y轴的正半轴上,点A与原点重合,一次函数y=-1/2x+b的图像分别交y轴,x轴于点E,F,当矩形ABCD沿直线y=-1/2+b折叠时,点A落在DC上的A╰处,求点A╰处的坐标和b的值](/uploads/image/z/3941959-31-9.jpg?t=%E7%9F%A9%E5%BD%A2ABCD%E4%B8%AD%2CAB%3D2%2CAD%3D1%E8%BE%B9AB%2CAD%E5%88%86%E5%88%AB%E5%9C%A8x%E8%BD%B4%E7%9A%84%2Cy%E8%BD%B4%E7%9A%84%E6%AD%A3%E5%8D%8A%E8%BD%B4%E4%B8%8A%2C%E7%82%B9A%E4%B8%8E%E5%8E%9F%E7%82%B9%E9%87%8D%E5%90%88%2C%E4%B8%80%E6%AC%A1%E5%87%BD%E6%95%B0y%3D-1%2F2x%2Bb%E7%9A%84%E5%9B%BE%E5%83%8F%E5%88%86%E5%88%AB%E4%BA%A4y%E8%BD%B4%2Cx%E8%BD%B4%E4%BA%8E%E7%82%B9E%2CF%2C%E5%BD%93%E7%9F%A9%E5%BD%A2ABCD%E6%B2%BF%E7%9B%B4%E7%BA%BFy%3D-1%2F2%2Bb%E6%8A%98%E5%8F%A0%E6%97%B6%2C%E7%82%B9A%E8%90%BD%E5%9C%A8DC%E4%B8%8A%E7%9A%84A%E2%95%B0%E5%A4%84%2C%E6%B1%82%E7%82%B9A%E2%95%B0%E5%A4%84%E7%9A%84%E5%9D%90%E6%A0%87%E5%92%8Cb%E7%9A%84%E5%80%BC)
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