x+y-3z=1
y+z-3x=2
z+x-3y=3
以上三个式子相加：
2x+2y+2z-3x-3y-3z=6
x+y+z=-6
(4)-(1) z=-5/4
(4)-(2) x=-2
(4)-(3) y=-9/4
x+y-3z=1 y+z-3x=2 z+x-3y=3
1个回答
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