已知2x+3y-4z=0,3x+4y+5z=0,且xyz≠0
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不等于0,且x/3=y/4=z/5,求【2x-3(2y-z)】/x+y+z
已知2x+3y-4z=0,3x+4y+5z=0,且xyz≠0 .(1)分别用含有z的代数式表示x、y (2)求x+y+z
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)
(x-3y+z)^2+/ 5x-4y+z/=0 且xyz≠0 xy+yz+zx/x^2+y^2+z^2
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
已知方程组4x-y+3z=0,2x+y+6z=0.且xyz不等于0,则x:y:z=
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
已知2x-4y-5z=0,-3x+y+4z=0 (xyz≠0)则x/y/z=?
已知2x-4y-5z=0,-3x+y+4z=0,(xyz≠0)则x: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
已知方程组x-2y+4z=0,2x+3y-13z=0,且xyz≠0,使用含x的代数式表示y