若x+2y+z=0,5x+4y-4z=0,求(x^2+ 6y^(2 )-10z^2)/(3x^2 -4y^2+5z^2 )的值若x+2y+z=0,5x+4y-4z=0,求(x^2+ 6y^(2)-10z^2)/(3x^2-4y^2+5z^2 )的值,

若xyz≠0且4(x/z)-5(y/z)=-2,(x/z)+4(y/z)=3,求x:y:z 2x+z=10 x+y-z=4 3x-y-z=0 若（z-x)的平方-4(x-y)(y-z)=0试确定x-2y+z若（z-x)^2-4(x-y)(y-z)=0试确定x-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)=____. 1.若3x-2y+z=2;3x+2y+5z=4,求x+22.若x-3y+z=0;3x-3y-4z=0,求x:y:z 若实数XYZ满足2|x-y|+√2y+z+z方-z+1//4=0 求X+Y+Z 2y+z在根号里 已知x+4y-3z=0,4x-5y+2z=0,则x：y：z 若（z-x）^2-4(x-y)(y-z)=0,试说明:x-2y+z=0 若(z-x)的二次方-4(x-y)(y-z)=0,求证x-2y+z=0 已知{x-5y+2z=0 3x-5y-4z=0,求x：y:z 5x+4y+z=0 3x+y-4z=13 x+y+z=—2 已知x,y,z,满足方程组x-2y+z=0,7x+4y-5z=0 若(z-x)^2-4（x-y）（y-Z)=0,试说明x-2y+z=0. 若x/2=y/3=z/4不等于0,求x+y+z/x+y-z的值 X-Y-Z=0 X+Y-3Z=4 2X-5Y+7Z=21 2x+3y-z=9,x+y+z=15,5x-4y-z=0 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= 已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z