若x-y+z=0,2x-3y-4z=0,且xyz≠0,求(2x²+3y²+4z²）/（x&

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：(x+y-z)/z=(x-y+z)/y+(y+z-x)/x,且xyz≠0,求代数式[(x+y)(y+z)(x+z) 若xyz不等于0,且{4x-5y+2z=0,x+4y-3z=0,求x:y:z 若1/2x=1/3y=1/4z且xyz不等于0,求x:y:z 已知x+y-z/z=x-y+z/y=-x+y+z/x,且xyz不等于0,求分式[(x+y)(x+z)(y+z)]/xyz 方程组:x-2y+4z=0,2x+3y-3z=0...xyz不等于0,求(2x+y-z)\(2x-y+z) 已知4x-3y+z=0,x+2y-8z=0,xyz不等于0,求x+y-z/x-y+2z的值 若x+2y-9z=0,z-3y-5z=0,（xyz≠0）求：x²-4y²+9z²分之（2x 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(y+z)/x=(z+x)/y=(x+y)/z,求(y+z)(z+x)(x+y)/xyz的值? 若4x-3y-6z=0,x+2y-7z=0且xyz≠0； 求(2x+3y+6z)/(x+5y+7z)的值? 已知x/2=y/3=z/4且xyz不等于0,求2x+3y-z/x-3y+z拜托各位了 3Q