y-3x-2z=1,①
x+2y+3z=9,②
5x-7y+z=34③
解方程组:
②-①X2: 7x+7z=7, x+z=1, 16x+16z=16.
③+①X7: 16x+13z=-41 3z=57, z=19, x=-18, y=-15.
x=-18,
y=-15
z=19
y-3x-2z=1,①
x+2y+3z=9,②
5x-7y+z=34③
解方程组:
②-①X2: 7x+7z=7, x+z=1, 16x+16z=16.
③+①X7: 16x+13z=-41 3z=57, z=19, x=-18, y=-15.
x=-18,
y=-15
z=19