设集合A={(x,y)|y≥|x-2|,x≥0}B={(x,y)|y≤-x+b}.若(x,y)∈A∩B,且x+2y的最大值为9,求b的值.
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![设集合A={(x,y)|y≥|x-2|,x≥0}B={(x,y)|y≤-x+b}.若(x,y)∈A∩B,且x+2y的最大值为9,求b的值.](/uploads/image/z/4335647-23-7.jpg?t=%E8%AE%BE%E9%9B%86%E5%90%88A%3D%7B%28x%2Cy%29%7Cy%E2%89%A5%7Cx-2%7C%2Cx%E2%89%A50%7DB%3D%7B%28x%2Cy%29%7Cy%E2%89%A4-x%2Bb%7D.%E8%8B%A5%28x%2Cy%29%E2%88%88A%E2%88%A9B%2C%E4%B8%94x%2B2y%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC%E4%B8%BA9%2C%E6%B1%82b%E7%9A%84%E5%80%BC.)
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