(1)y=5-x-3z ---- x+y+3z=5----(1)与(2)相减得2z=4;z=2
(2)x+y+z=1
(3)-x+2y+z=2与(2)相加得(4)
(4)3y+2z=3;把z=2代入到(4)
3y+4=3
3y=-1
y=-1/3
x=1-y-z=1-(-1/3)-2=-2/3
(1)y=5-x-3z ---- x+y+3z=5----(1)与(2)相减得2z=4;z=2
(2)x+y+z=1
(3)-x+2y+z=2与(2)相加得(4)
(4)3y+2z=3;把z=2代入到(4)
3y+4=3
3y=-1
y=-1/3
x=1-y-z=1-(-1/3)-2=-2/3