(x-3y+2z)²=
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
(x-3y+2z)²=
x/2=y/3=z/5 x+3y-z/x-3y+z
已知x,y,z 大于0,x+y+z=2,求证 xz/y(y+z)+zy/x(x+y)+yx/z(z+x)大于等于2/3
x=y/z=z/3,x+y+z =12,求2x+3y+4z是多少,
若3x-2y-z=0,x+4y-3z=0,求3x²+y²/4x²-y²+z
如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y,
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
3道高数题,1,函数F(x,y,z)=(e^x) * y * (z^2) ,其中z=z(x,y)是由x+y+z+xyz=
{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2
如果,根号x-3+| y-2 |+z^2=2z-1 求 (x+z)^y