运筹学教程(胡运权主编,清华第三版)部分习题答案(第一章)1
1(1)无穷多解:(6/5,1/5)+(1-)(3/2,0),[0,1]
(2)无可行解;(3)x*=(10,6),z*=16;(4)最优解无界
2(1)maxz’=3x1-4x2+2x3-5x’4+5x’’4s
–4x1+x2–2x3+x’4–x’’4=2x1+x2–x3+2x’4–2x’’4+x5=14–2x1+3x2+x3–x’4+x’’4–x6=2x1,x2,x3,x’4,x’’4,x5,x60(2)maxz’=2x’1+2x2–3x’3+3x’’3s
x’1+x2+x’3–x’’3=42x’1+x2–x’3+x’’3+x4=6x’1,x2,x’3,x’’3,x4,01
3(1)基解:(0,16/3,-7/6,0,0,0);(0,10,0,-7,0,0);(0,3,0,0,7/2,0),是基可行解,z=3,是最优解;(7/4,-4,0,0,0,21/4);(0,16/3,-7/6,0,0,0);(0,0,-5/2,8,0,0);(1,0,-1/2,0,0,3);(0,0,0,3,5,0),是基可行解,z=0;(5/4,0,0,-2,0,15/4);(3/4,0,0,0,2,9/4),是基可行解,z=9/4;(0,0,3/2,0,8,0),是基可行解,z=3,是最优解
(2)基解:(-4,11/2,0,0);(2/5,0,11/5,0),是基可行解,z=43/5;(-1/3,0,0,11/6);(0,1/2,2,0),是基可行解,z=5,是最优解;(0,-1/2,0,2);(0,0,1,1),是基可行解,z=5,是最优解;最优解:(0,1/2,2,0)+(1-)(0,0,1,1),[0,1]
4(1)x*=(1,1
5),z*=17
5(2)x*=(15/4,3/4),z*=33/41