①:2×一y+3z=3,②:3x+y一2z=-1,③:x+y+z=5;

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①:2×一y+3z=3,②:3x+y一2z=-1,③:x+y+z=5;①:2×一y+3z=3,②:3x+y一2z=-1,③:x+y+z=5;①:2×一y+3z=3,②:3x+y一2z=-1,③:x+y

①:2×一y+3z=3,②:3x+y一2z=-1,③:x+y+z=5;
①:2×一y+3z=3,②:3x+y一2z=-1,③:x+y+z=5;

①:2×一y+3z=3,②:3x+y一2z=-1,③:x+y+z=5;