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A.10,0 B.,0 C.,-1 D.10,-1
已知变量x,y满足条件设z=2x+y,取点(3,2)可求得z=8,取点(5,2)可求得zmax=12,取点(1,1)可求得zmin=3,取点(0,0)可求得z=0,则点(3,2)叫做________,点(0,0)叫做________,点(5,2)和点(1,1)均叫做________.