若2X+5Y+4Z=0,3X+Y-7Y=0,则X+Y-Z=()
2x+5y+4z=0,3x+y-7z=0,则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
若{x+3y+10z=0 则 (x+y-z)/(x-y+z)
若x-2y+4z=1,x+3y-7z=0,则y:z=?
已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z
已知,方程组:4x-3y-7z=0 x+2y=10z 则(x-y+z)÷(x+y+z)=——
已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值
2x+3y-4z=0.,3x+4y+5z=0,则x+y+z/x-y+z详细的解题过程
若2x+5y+4z=0 ,3x+y=0;则x+y-z=?
若x+2y-9z=0,x-2y+5z=0,(x.y.z≠=0)求2x平方+3y平方+7z平方/x平方-4y平方+4z平方
已知3x-2y-5z=0,2x-5y+4z=0,且x,y,z均不为0,求3x*x+2y*y+5z*z/5x*x+y*y-
若2x+5y+4z=0,3x+y+7z=0,则x+y-z=?