{x-z=-1 2x+y+3z=5 x +y-z=1 怎么解,
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{x-z=-1 2x+y+3z=5 x +y-z=1 怎么解,
{x-z=-1 2x+y+3z=5 x +y-z=1 怎么解,
{x-z=-1 2x+y+3z=5 x +y-z=1 怎么解,
x-z=-1 ——(1)
2x+y+3z=5 ——(2)
x y-z=1——(3)
(1)代入(3),得-1+y=1,
解得y=2.
(2)化为2x+3z=3——(4)
(1)乘以3得3x-3z=-3,
与(4)加得
5x=0,
x=0
代入(1),
得z=1
所以,
x=0
y=2
z=1
x/2=y/3=z/5 x+3y-z/x-3y+z
{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2
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{x+y+z=1 x-2y+3z=5 2x-3y-3z=-8
2x-y+3z=3 {3X+Y-2Z=-1 X+Y+Z=5
x-y+z=-1 5x+2y-z=6 4x-3y+2z=-5
x+y+z=-5,3x+y+z=1,4x+3y+2z=-2快
3x+2y+z=14 ,x+y+z=10,z+2x+3y=1 5
3x-y+2z=-1 4x+y+z=5 x-2y-z=-2
{x+y+z=1 {x+3y+7z=-1 {x+5y+8z=2
x+y+z=-1 4x-2y+3z=5 y-z=8-2x
x+y+z=2 x-3y+2z=1 2x+2y+z+5 要具体步骤..