解:设购买M、N饲料各为x,x,贝 Minz=1ox+4x 0.lx1+0x2≥04 0x1+0.1x2≥0.6 st0.1x+0.2x2≥20 0.2x1+0.1x2≥1.7 xx2≥0解：设购买M、N饲料各为 ，则 Minz =10x1 + 4x 2           +  +  +  +  , 0 0.2 0.1 1.7 0.1 0.2 2.0 0 0.1 0.6 0.1 0 0.4 . . 1 2 1 2 1 2 1 2 1 2 x x x x x x x x x x st 1 2 x , x