第一題: 求此題的對偶
max:       3 yellow + 5 black - 4 purple  +2 blue;
solid:     5 yellow + 2 black             +3 blue <= 32;
liquid:    7 yellow + 9 black + 3 purple  -  blue <= 48;
gas:                  3 black + 5 purple  +4 blue <= 91;

//	0 <= yellow < +inf;
//	0 <= black < +inf;
//	0 <= purple < +inf;
//	0 <= blue < +inf;


第二題: 求此題的對偶
min:       6 drgeo  -2 gnuplot  -2 maxima -5 octave;
fedora:    3 drgeo  -  gnuplot  +7 maxima +  octave >= 18;
ubuntu:    - drgeo  +7 gnuplot  +4 maxima +3 octave <= 79;
knoppix:   5 drgeo  -3 gnuplot            +2 octave  = 21;

	-inf < drgeo < +inf;
//	0 <= gnuplot < +inf;
//	0 <= maxima < +inf;
	-inf < octave <= 0;


















第一題: 求此題的對偶
min:      42 cpu + 39 memory +17 mouse +25 printer;
k900:      2 cpu -  5 memory  -3 mouse  +4 printer >= 17;
civic:    14 cpu +  3 memory  +4 mouse  +5 printer >=  9;
premium:   5 cpu              +7 mouse  +  printer >= 10;

//	0 <= cpu < +inf;
//	0 <= memory < +inf;
//	0 <= mouse < +inf;
//	0 <= printer < +inf;


第二題: 求此題的對偶
max:         apple  +4 orange  -3 banana +  grape;
morning:  -4 apple  +2 orange  +7 banana +2 grape >= 49;
noon:               +3 orange  -5 banana +  grape <= 38;
night:     7 apple  +  orange  -2 banana +5 grape  = 65;

	-inf < apple < +inf;
//	0 <= orange < +inf;
	-inf < banana <= 0;
//	0 <= grape < +inf;