已知集合P={(x,y)|{3x-4y+3≥0,4x+3y-6≤0,y≥0}},Q={(x,y)|(x-a)²+(y-b)²≤r²,r>0}若"点M∈P"是"点M∈Q"的必要条件,则当r最大时,ab的值是多少?
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![已知集合P={(x,y)|{3x-4y+3≥0,4x+3y-6≤0,y≥0}},Q={(x,y)|(x-a)²+(y-b)²≤r²,r>0}若](/uploads/image/z/394354-10-4.jpg?t=%E5%B7%B2%E7%9F%A5%E9%9B%86%E5%90%88P%3D%7B%28x%2Cy%29%7C%7B3x-4y%2B3%E2%89%A50%2C4x%2B3y-6%E2%89%A40%2Cy%E2%89%A50%7D%7D%2CQ%3D%7B%28x%2Cy%29%7C%28x-a%29%26%23178%3B%2B%28y-b%29%26%23178%3B%E2%89%A4r%26%23178%3B%2Cr%3E0%7D%E8%8B%A5%22%E7%82%B9M%E2%88%88P%22%E6%98%AF%22%E7%82%B9M%E2%88%88Q%22%E7%9A%84%E5%BF%85%E8%A6%81%E6%9D%A1%E4%BB%B6%2C%E5%88%99%E5%BD%93r%E6%9C%80%E5%A4%A7%E6%97%B6%2Cab%E7%9A%84%E5%80%BC%E6%98%AF%E5%A4%9A%E5%B0%91%3F)
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