因式分解2(x^2y^2+y^2z^2+z^2x^2)-(x^4+y^4+z^4)

因式分解2(x^2y^2+y^2z^2+z^2x^2)-(x^4+y^4+z^4) (x+2y-7z)^3+(3x-4y+6z)^3-(4x-2y-z)^3 因式分解 设x、y、z为整数,证明:x^4*(y-z)+y^4*(z-x)+z^4*(x-y)/(y+z)^2+(z+x)^2+( 因式分解 (x+y+z)^2+yz(y+z)+xyz (y-x)/(x+z-2y)(x+y-2z)+(z-y)(x-y)/(x+y-2z)(y+z-2x)+(x-z)(y-z 求解2x≥x+y+z 4y≥x+y+Z 8z≥x+y+z x、y、z均大于0 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) 因式分解：25x y^2 z^2 (x+y-z)-30xyz(z-x-y)^2+5x y z^3 (z-x-y) x=y/z=z/3,x+y+z ＝12,求2x+3y+4z是多少, 化简(y-x)(z-x)/(x-2y+z)(x+y-2z)+（z-y)(x-y)/(x-2z+y)(y+z-2x)+(x (x-2y+z)(x+y-2z)分之（y-x)(z-x) + (x+y-2z)(y+z-2x)分之(z-y)(x-y) 化简(y-x)(z-x)/(x-2y+z)(x+y-2z)+（z-y)(x-y)/(xy-2z)(y+z-2x)+(x-