問(wèn)答題

寫(xiě)出下列線(xiàn)性規(guī)劃問(wèn)題的對(duì)偶問(wèn)題 
max z=2x1+2x2-4x3
x1 + 3x2 + 3x3 ≤30 
4x1 + 2x2 + 4x3≤80 
x1、x2,x3≥0


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