minz=13x1+9x2+10x3+11x4+12x5+8x6 x1+x4=400 x,+x。=600 x2+x6=500 st 0.4x1+1.1x,+x2≤800 0.5x,+1.2x+1.3x≤900 x.≥0i=12.….6 解答min 13 1 9 2 10 3 11 4 12 5 8 6 z = x + x + x + x + x + x            = + +  + +  + = + = + = 0, 1,2, ,6 0.5 1.2 1.3 900 0.4 1.1 800 500 600 x 400 . . 4 5 6 1 2 3 3 6 2 5 1 4 x i  x x x x x x x x x x x st i 解答