已知(x-2y)²+ |Y-3Z |=0 求x+y-2z/x+2y+z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2x+3y-4z=0,3x+4y+5z=0,求x+y+z/(除以)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-3y=x+2z,求x²-9y²+4z²+4xz的值
若/x+2y-5/+(2y+3z-13)²+(3z+x-10)²=0,试求x,y,z的值.
已知x,y,z满足条件(x-2y-4)²+(2y+z)²+丨x-4y+z丨=0,求3x+y-z的值
已知|x+(-2)|+|y+3|+|z|=0,求x+y+z的值.
已知X²+y²+z²—2x+4x-6z+14=0,求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.
1.若/x-3/+(2x-y)²+根号y+z=0,求x,y,z的值.
已知x²+y²+z²-2x+4y-6z+14=0,求代数式(x-y-z)²&or
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