若3(X^2+Y^2+Z^2)=(X+Y+Z)^2,那么你知道X,Y,Z,之间有什么关系吗?
若3(X^2+Y^2+Z^2)=(X+Y+Z)^2,那么你知道X,Y,Z,之间有什么关系吗?
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
(y-x)/(x+z-2y)(x+y-2z)+(z-y)(x-y)/(x+y-2z)(y+z-2x)+(x-z)(y-z
x/2=y/3=z/5 x+3y-z/x-3y+z
y=-2X,Z=3y,那么X-Y+(-Z)等于
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)
4x-3y-6z=0,x+2y-7z=0是一个方程组,那么x-y+z/x+y+z的值等于
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
化简(y-x)(z-x)/(x-2y+z)(x+y-2z)+(z-y)(x-y)/(x-2z+y)(y+z-2x)+(x
x.y.z.m都是有理数,并且x+y+2z=m,x+2y+3z=m,那么y与z( )
(x+y-z)^2-(x-y+z)^2=?
(x-2y+z)(x+y-2z)分之(y-x)(z-x) + (x+y-2z)(y+z-2x)分之(z-y)(x-y)