{x-y-z=5 {y-x-z=1 {z-x-y=-15 x=?y=?z=?
3个回答
{x-y-z=5 (1)
{y-x-z=1 (2)
{z-x-y=-15 (3)
(1)+(2)得-2Z=6
z=-3
(2)+(3)得-2X=-14
X=7
(1)+(3)得-2Y=-10
y=5
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