若xy-z不等于0,且(y+x)/x=(z+x)/y=(y+x)/z,求[(y+z)(z+x)(x+y)]/xyz的值?

若xy-z不等于0,且(y+x)/x=(z+x)/y=(y+x)/z,求[(y+z)(z+x)(x+y)]/xyz的值? 已知xy/5=y+z/6=z+x/7,且xyz不等于0,求x:y:z 若xyz不等于0,且(y+z)/x=(z+x)/y=(x+y)/z,求(y+z)(z+x)(x+y)/xyz的值? 若xyz不等于0,且满足(y+z)/x=(x+z)/y=(x+y)/z,求（y+z)（x+z)（x+y)/xyz的值 若xyz不等于0,且满足(y+z)/x=(x+z)/y=(x+y)/z,求（y+z)（x+z)（x+y)/xyz的值 请说明：若x^2+y^2+z^2=xy-yz-xz,且xyz不等于0,则x=y= -z 请说明:若X^2 + 2Y^2 + Z^2=XY-YZ-XZ,且XYZ不等于0,则X=Y=-Z 若xy-z=0,且(y+x)/x=(z+x)/y=(y+x)/z,求[(y+z)(z+x)(x+y)]/xyz的值? 若2x-3y-z=0,x+3y-14z=0,且z不等于0则(x^2+3xy)/(y^2+z^2)值是多少? 若3x^2+3xy=0且xy不等于0,则x:y= 若x、y、z均不等于0,且2x+y-z=0 x+8y+2z=0,则x:y:z=? 若x+y+z不等于0且2y+z/x=2x+y/z=2z+x/y=k,k=? 若x+y+z不等于0 且 2y+z/x=2x+y/z=2z+x/y=k 若x+y+z=0且xyz不等于0,求x(1/y+1/z)+y(1/x+1/z)+z(1/x+1/y)的值 若(4x-3y-3z)^2+|x-3y-z|=0 且xyz不等于0 则4x+y-z/x+y+z 的值 已知：xy/(x+y)=a,xz/(x+z)=b,yz/(y+z)=c,且abc不等于0,求证:x=2abc/(bc+ac-ab) 已知：xy/(x+y)=a,xz/(x+z)=b,yz/(y+z)=c,且abc不等于0,求证：x=2abc/(bc+ac-ab) 已知xy/(x+y)=a,xz/(x+z)=b,yz/(y+z)=c,且a,b,c不等于0,求x的值