若|x-2|+|3x-6y|+(3y+z)²=0,求x+y+z的值
若|x-2|+|3x-6y|+(3y+z)²=0,求x+y+z的值
若x/2=y/3=z/4不等于0,求x+y+z/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.
若x-y=6,xy=-8,求代数式(x+y+z)²+(x-y-z)(x-y+z)-2·z(x+y)的值
已知x^3+y^3-6x+2y+z+3+10=0,求(x-y+z)(x+y-z)的值.(z+3)是绝对值
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
已知x²+y²-6x+2y+|z+3|+10=0,求x+z-y的值
已知x、y、z满足方程组:x+y-z=6;y+z-x=2;z+x-y=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
如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y,
若x/3=y/4=z/5,求x+y+z/3x-2y+z的值.
若x:y:z=2:3:4,求x+y+z/x-2y+3z的值