已知5/x=4/y=3/z,z不等于0.求:3x-2y/x+y+z等于多少?
已知5/x=4/y=3/z,z不等于0.求:3x-2y/x+y+z等于多少?
已知x,y,z满足{4x-3y-3z=0,x-3y+z=0.(x不等于0,y不等于0,z不等于0)求x/z和y/z的值
已知x=y/3=z/5.且x+y-2z不等于0.求2x+3y-z/x+y-2z的值是多少
已知x/2=y/3=z/4,且x+y+z不等于0,求2x+3y-4z/x+y+z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
方程组:x-2y+4z=0,2x+3y-3z=0...xyz不等于0,求(2x+y-z)\(2x-y+z)
X+Y+Z=200,1/3X+4Y+5Z=200,求X,Y,Z等于多少?
已知3x=4y=5z,且x不等于0,求2x-3y+6z/3x-2y+4z=?
已知2x+5y+4z=15,7x+y+3z=14,求4x+y+z等于多少?
如果x/2=y/7=z/5,x,y,z都不等于0,则(x+y+z)/(3x-y)等于多少?
已知2x+3y-4z=0,3x+4y-5z=0.求x+y+z除以x-y+z,
已知4x-3y-3z=0,x-3y+z=0(z不等于0)求x:z,y:z