已知|X—Z|+|2Y+B|=0,求(2X—3Y)×(2X+3Y)的值
已知2x+3y-4z=0,3x+4y+5z=0,求x+y+z/(除以)x-y+z的值.
已知|x+(-2)|+|y+3|+|z|=0,求x+y+z的值.
已知x=3y,z=7y(x≠0),求代数式2x+3y-z分之x+y+z的值
已知x::y:z=3:4:5,(1)求x+y分之z的值;(2)若x+y+z=6,求x,y,z.
已知x=3y,z=7x(x不等于0),求代数式2x+3y-z分之x+y+z的值
已知X Y Z满足3x-2y+z的绝对值+2x+y+2z的绝对值=0(x,y,z不等于0),求x+y除以Z的值
已知X,Y,Z满足|3X-2Y+Z|+|2X+Y+2Z|=0(X,Y,Z≠0),求(X+Y)/Z的值
已知4x-3y-6y=0,x+2y-7z=0.求x-y+z\x+y+z的值
已知x+y-z=0,2x-y+2z=0 求(3x-2y+5z)/(5x-3y+2z)的值
已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z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
已知有理数x,y,z满足|x-z-2|+|3x-6y-7|+(3y+3z-40)^2=0,求x,y,z的值