2x-3y-z=-6 7x-y+2z=-17 x-y+z=-6
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2x-3y-z=-67x-y+2z=-17x-y+z=-62x-3y-z=-67x-y+2z=-17x-y+z=-62x-3y-z=-67x-y+2z=-17x-y+z=-62x-3y-z=-6——式
2x-3y-z=-6 7x-y+2z=-17 x-y+z=-6
2x-3y-z=-6 7x-y+2z=-17 x-y+z=-6
2x-3y-z=-6 7x-y+2z=-17 x-y+z=-6
2x-3y-z=-6——式子1
7x-y+2z=-17——式子2
x-y+z=-6——式子3
式子1+式子3得：3x-4y= -12,y=(3x+12)/4
式子2-式子3得：6x+z= -11,z= -6x-11
把y、z代入式子3得：x-(3x+12)/4+(-6x-11)= -6,4x-3x-12-24x-44=-24,x= -32/23
代入求得：y=45/23,z= -61/23
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z
x+y+z=6 x+2y+3z=14 y+1=z
若X:Y:Z=5:6:7那么(Y-X):(Y+Z)和(X+2Y+3Z):(3X+2Y+Z)
(1)X+Y=15,Y+Z=-6,Z+X=7.(2)X+Y=-14,Y+Z=-7,Z+X=9.(3)X+Y=0,Y+Z=-1,Z+X=-1.
2x-3y-z=-6 7x-y+2z=-17 x-y+z=-6
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
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
解三元一次方程组 ①2x-y+z=1 3x+y -2z=2 X+2y-z=3 ②x-4y+z=-3 2x+Y-Z=18 X-Y-Z=7 ③4x+4y+2z=7 6X-4y-z=6 2x-y+z=1
6x+3y-2z=108,9x+7y-3z=212,3x-2y+5z=38,求x,y,z
已知4x-3y-6z=0,x+2y-7z=0,求5x+2y-z/2x-3y-10z
若4x-3y-6z=0,x+2y-7z=0,则x+y+z/3x-y+z=?
已知：4x-3y-6z=0,x+2y-7z=0.求出x-y+z÷x+y+z=?
已知4x-3y-6z=0,x+2y-7z=0,则x-y+z/x+y+z=_________
已知4x-3y+6z=0 x+2y-7z=0 则x-y+z/x+y-z=?
4x-3y-6z=0,x+2y-7z=0,x-y+z/x+y+z=?