2x+5y+4z=0 ,3x+y-7z=0,则x+y-z的值为多少?
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2x+5y+4z=0,3x+y-7z=0,则x+y-z的值为多少?2x+5y+4z=0,3x+y-7z=0,则x+y-z的值为多少?2x+5y+4z=0,3x+y-7z=0,则x+y-z的值为多少?2
2x+5y+4z=0 ,3x+y-7z=0,则x+y-z的值为多少?
2x+5y+4z=0 ,3x+y-7z=0,则x+y-z的值为多少?
2x+5y+4z=0 ,3x+y-7z=0,则x+y-z的值为多少?
2x+5y+4z=0(1)
3x+y-7z=0 (2)
(1)*3-(2)*2消去x,得13y-26z=0,得y=2z;
(2)*5-(1)消去y,得13x-39z=0,x=3z;
所以,x+y-z =3z-2z-z=0.
2x+5y+4z=0, 3x+y-7z=0.
x+y-z
=(2/13)*(2x+5y+4z)+(3/13)*(3x+y-7z)=0.
X-Y-Z=0 X+Y-3Z=4 2X-5Y+7Z=21
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
已知4x-3y-6z=0,x+2y-7z=0,求5x+2y-z/2x-3y-10z
已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值
三元一次方程解 1.{x+y-z=5 {3x+2y+z=2 {2x-2y+z=-31.{x+y-z=5 2.{9x-5y+x=-6 3.{x-y=3 4.{x+y=3 5.{4x-2y+z=7{3x+2y+z=2 {9x+y-2z=3 {x+z=7 {y+z=4 {2x-y-3z=28{2x-2y+z=-3 {-9x+3y-5z=0 {y-z=6 {z+x=5 {x+y-2z=13
已知x,y,z满足方程组x-2y+z=0 7x+4y-5z=0,且z不等于0,2x²-3y²+z²/y²-2z²的值为?
已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX..
六年级三元一次方程组.解下列方程组:(1)5x-3y+z=25x+2y-4z=3-5x+y-z=2(2)x-y-z=-13x_5y+7z=114x-y+2z=-1(3)9x-5y+z=-69x+y+4z=3-9x+3y-5z=0(4)x+y=22x+z=-27y+z=13
已知:4x-5y+2z=0 x+4y-3z=0则:(x*x+y*y+z*z)/(x*y+y*z+z*x)=____.
2x+z=10 x+y-z=4 3x-y-z=0
x+y+z=0,3x-2y-2z=5,y-z=2x-7
已知x,y,z,满足方程组x-2y+z=0,7x+4y-5z=0
2x+5y+4z=6,3x+y-7z=-4,x+y-z=?
已知{x-5y+2z=0 3x-5y-4z=0,求x:y:z
已知x+4y-3z=0,4x-5y+2z=0,则x:y:z
5x+4y+z=0 3x+y-4z=13 x+y+z=—2
3x+7y+4z=35,x+5y+2z=40,x+y+z=( )
{x+y+z=1 {x+3y+7z=2 {x+5y+19z=4