X+Y+Z=0 ,2X-Y-7Z=0.求分式 3xy-4z^/x^-y^
x+y+z=0,2x-y-7z=0,求分式3xy-4z的平方除以x的平方-y的平方
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
x y z 满足等式x/4=y/3=z/2不等于0,求分式x二次方+y二次方/xy-xz的值
已知4x-3y-6y=0,x+2y-7z=0.求x-y+z\x+y+z的值
1.已知3x-4y-z=0,2x+y-8z=0.求x²+y²+z²/xy+yz+2xz 的
已知{X-3Y+7z=0,x-2y+4Z (xy不等于0).求X:Y:Z
若xy-z不等于0,且(y+x)/x=(z+x)/y=(y+x)/z,求[(y+z)(z+x)(x+y)]/xyz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)
已知2x+3y-4z=0,3x+4y-5z=0.求x+y+z除以x-y+z,
已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值
已知有理数x、y、z满足条件|x-z-2|+(3x-6y-7)^2+|3y+3z-4|=0,求x、y、z
已知实数x,y,z满足x²-6xy+10y²+4y+|z²-3z+2|+4=0,求(x+y