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1、2x+9y=819x+4y=353x+y=348x+3y=307x+2y=527x+4y=62x+2y=213x+5y=564x+6y=549x+2y=872x+y=72x+5y=195x+7y=525x+2y=225x+5y=657x+7y=2038x+4y=56x+8y=159x+7y=13#x+8y=51x+4y=214x+y=295x+7y=415x+8y=447x+5y=543x+4y=38广 3x+6y=249x+5y=469x+2y=624x+3y=36厂 9x+4y=46Jx+4y=429x+3y=994x+7y=954x+y=41x+6y=274x+6y=16#x+3y=42
2、广 9x+2y=383x+6y=185x+5y=457x+9y=69厂 8x+2y=287x+8y=625x+4y=527x+6y=74x+6y=143x+3y=277x+4y=672x+8y=267x+y=96x+6y=48Px+2y=167x+y=116x+8y=687x+6y=664x+9y=778x+6y=942x+2y=227x+2y=472x+7y-z=24-J 4x-4y+z=-3x+y=5厂x+y+z=7J 2x+y-z=5x-y-2z=4厂a+b+c=O-4a+2b+c=39a-3b+c=285x-4y+4z=132x+7y-3z=193x+2y-z=18F+b+c=-2J
3、a-b+c=20a+b=0厂 3x-y+z=3J 2x+y-3z=11jX+y+z=12a+b+c=-4J 49a+7b+c=825a+5b+c=0免2y-3z+18=0YX+3y-2z-8=0x+y+2z-24=0x+y+z=122 x+2y-z=6j3x-y+z=10x+y=32 2x-y+2z=2x-y-z=-3厂 2x+3y=6J x-y+2z=-1x+2y-z=5乍a+b+c=OJ 4a+2b+c=52a-b+c=4J厂3x-y+z=4J x+y+z=62x+3y-z=12x+y-z=5J 2x+3y+z=10-2y-z=10x+y+z=6- x-y=12x-y+z=5x-y-5z=4Y 2x+y-3z=10j3x+y+z=83x-y+2z=3J 2x+y-3z=11jX+y+z=12Px+2y+5z=2J x-2y-z=6j4x+2y-7z=30厂 x+2y+3z=14J 2x+y+z=73x+y+2z=11x-y+z=lJ 3x+y-2z=2x+2y-z=3厂x+2y+3z=5- 2x+3y+6z=9j5x+3y+9z=15广x+y+z=6彳 2x+3y+z=113x-y-z=-23x-y+z=4J 2x+3y-z+12x+y+z=6x+2y+z=2J x-4y+z=5-2x-2y-5z=0
