问答题

用对偶单纯形法求解下列线性规划问题：min f=x₁+2x₂+3x₃，
s．t． 2x₁-x₂+x₃≥4，
x₁+x₂+2x₃≤8，
x₂-x₃≥2，
x₁，x_z，x₃≥0．

A.t．

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