已知x/2=y/3=z/5 且3x+2y-2z=4 求xyz的值
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/2等于y/3等于z/4,且x+y-z=5 求xyz的值
已知2X+5Y+4Z=0,3X+Y-7Z=0,且XYZ不等于0,求(X+Y+Z)/(2X-3Y+4Z)的值
x:y:z=2:3:4且x+y+z=18求xyz
已知xyz不等于0,且x/3=y/4=z/5,求【2x-3(2y-z)】/x+y+z
已知xyz不等于0,且x+2y-z=0,7x-y-z=0,求x+y+z/2x-y-z的值.
已知xyz满足方程组x+4y-3z=0,求x:y:z的值 4x-5y+2z=0
已知x/2=y/3=z/5 且3x+2y-2z=4 求xyz的值
已知2分之x=3分之y=4分之z,且3x-4y+5z=14,求xyz的值
已知x:y:z=4:5:6,且x+2y+3z=64,求xyz的值.用设k法,在线等
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 xyz≠0,且x+3y+z=0,2x+3y-z=0,求x+2y-7z/3x+5y+z 的值..