13.已知a>b>c >0,且2a^2+1/ab+1/a(a-b)-4ac+4c^2=4 ,则a+b+c= ▲ 注;b大于等于c
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![13.已知a>b>c >0,且2a^2+1/ab+1/a(a-b)-4ac+4c^2=4 ,则a+b+c= ▲ 注;b大于等于c](/uploads/image/z/175519-55-9.jpg?t=13.%E5%B7%B2%E7%9F%A5a%3Eb%3Ec+%3E0%2C%E4%B8%942a%5E2%2B1%2Fab%2B1%2Fa%28a-b%29-4ac%2B4c%5E2%3D4+%2C%E5%88%99a%2Bb%2Bc%3D+%E2%96%B2+%E6%B3%A8%EF%BC%9Bb%E5%A4%A7%E4%BA%8E%E7%AD%89%E4%BA%8Ec)
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