若3x+7y+z=5,4x+10y+z=3,则x+y+z=?
若3x+7y+z=5,4x+10y+z=3,则x+y+z=?
若{x+3y+10z=0 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
2x+5y+4z=0,3x+y-7z=0,则x+y-z=?
3x+7y+z=5 ,4x+10y+z=6 ,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,y,z满足3x+7y+z=5 4x+10y+z=3 求x+y+z的值
已知x、y、z满足{3x+7y+z=5 ,求x+y+z的值 {4x+10y+z=3
已知2x+3y-4z=7 3x-2y+z=3 x+5y+9z=20 则 x+y+z= 若x :y :z=2 :3 :7
若x-2y+4z=1,x+3y-7z=0,则y:z=?
x/2=y/3=z/5 x+3y-z/x-3y+z
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai