设x,y>=0,2x+y=6,求z=4x^2+3xy+y^2-6x-3y的范围
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设x,y>=0,2x+y=6,求z=4x^2+3xy+y^2-6x-3y的范围
![设x,y>=0,2x+y=6,求z=4x^2+3xy+y^2-6x-3y的范围](/uploads/image/z/17455326-6-6.jpg?t=%E8%AE%BEx%2Cy%3E%3D0%2C2x%2By%3D6%2C%E6%B1%82z%3D4x%5E2%2B3xy%2By%5E2-6x-3y%E7%9A%84%E8%8C%83%E5%9B%B4)
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