5)的最优解为(80,150.4,0), z6112;工时为紧约束; (6)的最优解为(80,0,94), (645,1677 536;工时为紧约束; 结论:此时最优解为 (80,150.4,0),利润为612 3 75,975) 可行域 5x1+3x2+5x3≤600, 280x1+250x,+400x2≤60000(5)的最优解为(80,150.4,0), z=611.2;工时为紧约束; (6)的最优解为(80,0,94), z=536;工时为紧约束;    + +  + +  280 250 400 60000, 1.5 3 5 600, . . 1 2 3 1 2 3 x x x x x x s t 结论:此时最优解为 (80,150.4,0), 利润为611.2 1 x x2 （64.5,167.7) • (75,97.5) ∙ 可行域 1 x 3 x