计算: (x-2y+z)(x+2y+z)要过程,谢
计算:(x-2y+z)(-x+2y+z)要过程,谢
若|x+1|+|y-2|+|z+3|=0,求|x|+|y|+|z|的值(要计算过程)
x+y-z=6 x-3y+2z=0 3x+2y-z=0 求x、y、z 要过程
(y-x)/(x+z-2y)(x+y-2z)+(z-y)(x-y)/(x+y-2z)(y+z-2x)+(x-z)(y-z
x,y,z正整数 x>y>z证明 x^2x +y^2y+z^2z>x^(y+z)*y^(x+z)*z^(x+y)
化简(y-x)(z-x)/(x-2y+z)(x+y-2z)+(z-y)(x-y)/(x-2z+y)(y+z-2x)+(x
三元方程求救要过程2x+3y+z=383x+4y+2z=564x+5y+z=66x:y=5:3x:z=7:32x-y-z
1.(x+y-z)*(x-y+z) 2.(x+y+z)*(x-y+z)要完整的过程
(x-2y+z)(x+y-2z)分之(y-x)(z-x) + (x+y-2z)(y+z-2x)分之(z-y)(x-y)
计算:3x-2y- [-4x+(z+3y)]
化简(y-x)(z-x)/(x-2y+z)(x+y-2z)+(z-y)(x-y)/(xy-2z)(y+z-2x)+(x-
计算(x+2y-3z)的平方+(x-2y+3z)(x+2y-3z)