4x-3y-6z=0 x+2y-7z=0 求2x²+3y²+6z²/x²+5y&
已知x²+y²+z²-2x+4y-6z+14=0,求x+y-z/x+y+z的值
已知实数x,y,z满足x²-6xy+10y²+4y+|z²-3z+2|+4=0,求(x+y
若4x-3y-6z=0,x+2y-7z=0,求代数式5x*5x+2y*2y-z*z/2x*2x-3y*3y-10z*10
已知x²+y²-6x+2y+|z+3|+10=0,求x+z-y的值
若|x-2|+|3x-6y|+(3y+z)²=0,求x+y+z的值
已知x,y,z满足x+y+2z=1,x²+y²+6z+1.5=0,求x,y,z的值
如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y,
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
若3x-2y-z=0,x+4y-3z=0,求3x²+y²/4x²-y²+z
已知4x-3y-6y=0,x+2y-7z=0.求x-y+z\x+y+z的值
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2x+5y+4z=6 3x+y-7z=-4求x+y-z