若4x=7y+5z,2x+y=z,则x:y:z的值为

若4x=7y+5z,2x+y=z,则x:y:z的值为 若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-z)= 若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-x)= 若3x+7y+z=5,4x+10y+z=3,则x+y+z=? 若x/2=y/3=z/4,则3x-2y+5z/x+y+z= 若4x-3y-6z=0,x+2y-7z=0,则x+y+z/3x-y+z=? 已知关于x y z的方程组2x-3y+5z=7 x+2y-3z=8,则4x+y-z= 若x+y+z=3y=2z,则x/x+y+z=? X/4=Y/5=Z/7则x+y+z/z=? 若x/2=y/3=z/4则3x-2y+5z/x+y+x= 若X:Y:Z=5:6:7那么(Y-X):(Y+Z)和(X+2Y+3Z):(3X+2Y+Z) 已知：4x-5y+2z=0 x+4y-3z=0则：(x*x+y*y+z*z)/(x*y+y*z+z*x)=____. 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 .且 x-2y+3z=34 则 x= y= z=? 三元一次方程组题目x+y-z=11 y+z-x=5 x-y+z=1x+y=4 y+z=3 x+z=5若已知x-3y+2z=0 2x+3y-8z=0, 且xyz≠0,则x:y:z= 若x/3=y/2=z/5,则2x-3y-z/x-y+z= 已知X+4Y+Z=24,2X+7Y+2Z=41,则x:y:z= 若x-y+z=-4,x^2-(y+z)^2=8,则x+y+z=如题 2x+5y+4z=6,3x+y-7z=-4,x+y-z=?