若{X-2Y+4Z=0,X+3Y-7Z=1.则3X-Y+Z=多少
x-3y+z=0,3x-2y-4z=0,则x:y:z=多少?
若{x+3y+10z=0 则 (x+y-z)/(x-y+z)
若x-2y+4z=1,x+3y-7z=0,则y:z=?
2x+5y+4z=0,3x+y-7z=0,则x+y-z=?
已知,方程组:4x-3y-7z=0 x+2y=10z 则(x-y+z)÷(x+y+z)=——
若4x-3y-6z=0,x+2y-7z=0,求代数式5x*5x+2y*2y-z*z/2x*2x-3y*3y-10z*10
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
如果x/2=y/7=z/5,x,y,z都不等于0,则(x+y+z)/(3x-y)等于多少?
若3x+7y+z=5,4x+10y+z=3,则x+y+z=?
已知{x-3y+2z=0 3x-3y-4z+0,则x:y:z=?
x+2y-4z=0 3x+y-z=0,则x:y:z=
x+2y-4z=0,3x+y-z=0,则x:y:z=?::