(数学模型 →X0=(3.9,1.4) =-17.5 x,<1 175≤z<+0 2≥2 P:①(4x2≤ 2 4)x,≥2 →X1=(3.5,1) →X2=(2.5,2) 14.5 15.5 x,<3 ≥4 2 x,≥3 P P→X3=(31)P不可行X3=12,2)y26不可行 13 14.8<-13 换界:z≤-13<+0 2 x,≥3: P0 1 4 T X (3.9, 1.4)  0 = z0 = −17.5 −   +  17.5 z T X (3.5,1)  1 = z1 = −14.5 1 : 4 P1 x2  1 x2  1 T X (2.5,2)  2 = z2 = −15.5 : 1 4 P2 x2  2 x2  2 x1  3 T P X (3,1) 3  3 = z3 = −13 x1  4 P4 不可行 x1  2 x1  3 P5  T X (2,2.2) 5 = z5 = −14.8 P6 不可行  −13  −  + x2  2 x2  3  换界: z 13