若丨x-y+2丨+丨y-x-3丨+(z-2)^2=0,求x+y-z的值.快.急用啊.

丨2x-3y+z丨+(x+2y-z)²=0和x+y+z=11组成三元一次方程组,求x,y,z 若丨x-y+2丨+丨y-x-3丨+(z-2)^2=0,求x+y-z的值.快.急用啊. 丨X丨=2,丨y丨=3,丨z丨=4,且x>y>z,求x+y+z的值. 已知x,y,z满足丨x-z-2丨+丨3x-3y-3丨=-(3y+2z-13)²;,求xyz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 丨x-2丨+丨x+2y丨+丨-x+y+3z丨=0,则x=?,y=?z=? 丨x-2丨+(2x-3y+z)的平方+(y-3)的四次方 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z 丨2x丨+丨y-3丨+【z+2】^2=0,则【x+z】^y的值等于 初一数学题三元一次方程已知x y z满足啊丨x-2-z丨+(3x-6y-7）²+丨3y+3z-4丨=0求x,y,z,的值.最佳给20 初一数学题三元一次方程已知x y z满足啊丨x-2+z丨+(3x-6y-7）²+丨3y+3z-4丨=0求x,y,z,的值. 2(x+y)(x+y-z)+3(y-z)(x+y-z) 若丨x-2丨+丨3x-6y丨+（3y+z）的平方等于0 1.（x+y-z)+(x-y+z)-(x-y-z) 2.2x-(3x-2y+3)-(5y-2) 已知丨x-8y丨+2(4y-1)²+丨8z-3x丨=0,求x+4y+12z的值 已知丨x-8y丨+2(4y-1)²+丨8z-3x丨=0,求x+4y+12z的值 (x-3y+2z)(x+3y-2z)