已知2^x=3^y=6^z,xyz不等于0,求证：(1/x)+(1/y)+(1/z)=0……1.已知2^x=3^y=6^z,xyz不等于0,求证：(1/x)+(1/y)+(1/z)=02.设a、b、c均是不等于1的正数,且a^x=b^y=c^z,(1/x)+(1/y)+(1/z)=0求abc.(提示：设a^x=b^y=c^z=10k>0,k不等于

已知方程组4x-y+3z=0 2x+y+6z=0且xyz不等于0,则x/y+y/z+z/x是多少 已知xyz满足|3x-2y+z|+|2x+y+2z|=0（xyz不等于o）求x+y除以z 已知方程组2x-3y+z=0 3x-2y-6z=0 且xyz不等于0求 x:y:z 已知方程组4x-y+3z=0,2x+y+6z=0.且xyz不等于0,则x:y:z=最好有过程 已知4x-3y+z=0,x+2y-8z=0,xyz不等于0,求x+y-z/x-y+2z的值 已知xy/5=y+z/6=z+x/7,且xyz不等于0,求x:y:z 已知x/2=Y/3=Z/4且xyz不等于0,求2X+3Y-Z/X-3Y+Z的值. 已知xyz不等于0,且x/3=y/4=z/5,求【2x-3(2y-z)】/x+y+z 已知X+4Y-3Z=0,4X-5Y+2Z=0(XYZ不等于0) 则X:Y:Z=_____ 已知x+4y-3z=0,4x-5y+2z=0(xyz不等于0),则x:y:z=? 已知方程组x-3y-2z=0,2x-y+z=0,且xyz不等于0,求x：y:z. 已知4x-5y+2z=0,x+4y-3z=0 且xyz不等于0,求x:y:z的值. 已知:(x+y)/z=(x+z)/y=(z+y)/x,且xyz不等于0,则分式(x+y)(x+z)(z+x)/xyz的值为? 已知xyz不等于0,且{x+3y+5z=0 x2+3y+z=0,则x.x+y.y-2z.2z/3x.3x+2y.2y+z.z=? 已知[2x-3y+z=0,3x-3y-6z=0,xyz不等于0,求x^2+y^2+z^2/2x^2+y^2-z^2 已知2x-3y+z=0,3x-2y-6z=0,xyz不等于0,求x*2+y*2+z*2/2x*2+y*2-z*2 已知4x-3y-6z=0,x+2y-7z=0(xyz不等于0),求2x+3y+6z除以x+5y+7z的值 已知2x-3y+z=0,3x-2y-6z=0,且xyz不等于0,求2x^+y^-z^分之x^+y^+z^的值