5x+4y+z=-7 4x+y-4z=-13 x+y+z=0
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5x+4y+z=-74x+y-4z=-13x+y+z=05x+4y+z=-74x+y-4z=-13x+y+z=05x+4y+z=-74x+y-4z=-13x+y+z=0首先根据式子3得z=x+y作式子
5x+4y+z=-7 4x+y-4z=-13 x+y+z=0
5x+4y+z=-7 4x+y-4z=-13 x+y+z=0
5x+4y+z=-7 4x+y-4z=-13 x+y+z=0
首先根据式子3得z=x+y作式子4
将4它代入到1,2中分别得到式子4X+3Y=-7 5
8X+5Y=-13 6
得X=(-7-3Y)/4并代入到式子6中得Y=-1即求得X=-1 Z=2
x-4y+z=-302x+y-z=18x--y-z=7
X/4=Y/5=Z/7则x+y+z/z=?
(x+y):(y+z):(z+x)=3:4:5 3x+y-z=-4已知(x+y):(y+z):(z+x)=3:4:5 ；3x+y-z=-4求x y z
5x+4y+z=-7 4x+y-4z=-13 x+y+z=0
2x+5y+4z=6,3x+y-7z=-4,x+y-z=?
已知2x+5y+4z=6 3x+y-7z=-4求x+y-z
X-Y-Z=0 X+Y-3Z=4 2X-5Y+7Z=21
若3x+7y+z=5,4x+10y+z=3,则x+y+z=?
3x+7y+4z=35,x+5y+2z=40,x+y+z=( )
{x+y+z=1 {x+3y+7z=2 {x+5y+19z=4
若4x=7y+5z,2x+y=z,则x:y:z的值为
已知4X=7Y+5Z,2X+Y=Z,那么X:Y:Z的值是?
已知4X=7y+5z,2x+y=z,那么x:y:z的值是?
已知x,y,z,满足方程组x-2y+z=0,7x+4y-5z=0
5x+3y+2z=2011 4x+6y+7z=2012 求x+y+z
1.{x:y:z=3:4:5 2x+3y-5z=-142.{x-y-z=-1 3x+5y+7z=11 4x-y+2z=-13.{x+y=1 x+z=0 2x+y+2z=44.{x-y+z=-3 2x-y-z=-2 -3x+y+z=-15.{x-y+z=-3 3x+y-4z=6 2x+y-z=36.{x-2y+5z=16 2x+y-5z=7 2x-y+z=38
x-y-z=-1 3x+5y+7z=11 4x-y+2z=-1 分别求出x=?y=?z=?
三元一次方程 X-y-z=-1 3x+5y+7z=11 4x-y+2z=-1 X=?Y=?Z=?