解方程组:(y+z)/x=(z+x)/y=(x+y)/z=k(x ,y,z为常数)
解方程组:(y+z)/x=(z+x)/y=(x+y)/z=k(x ,y,z为常数)
解方程组{x(x+y+z)=6,y(x+y+z)=12,z(x+y+z)=18
(x+y-z)(x-y+z)=
解方程组X-Y+Z=A,X+Y-Z=B,-X+Y+Z=C(A,B,C为常数)
X+Y+Z=?
x分之y+z=y分之z+x=z分之x+y(x+y+z不等于0),求x+y+z分之x+y-z
x,y方程组3x-2y-5z=0,2x-5y+4z=0,z为常数,求(3x平方+2y平方+5z平方)/(5x平方+y平方
解方程组 x+y+z=-7 x-y=12 x+y-z=6
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
f(x,y,z,w)=x*(x+y)*(x+y+z)*(x+y+z+w)
x,y,z为实数 且(y-z)^2+(x-y)^2+(z-x)^2=(y+z-2x)^2+(x+z-2y)^2+(x+y
x,y,z为实数且(y-z)平方+(x-y)平方+(z-x)平方=(y+z-2x)平方+(z+x-2y)平方+(x+y-