关于因式分解的几道数学题
(1)化简a3(b-c)+b3(c-a)+c3(a-b)=
(2)化简a3+b3+c3+bc(b+c)+ca(c+a)+ab(a+b)=
(3)已知(a+b)(b+c)(c+d)(d+a)=(a+b+c+d)(bcd+cda+dab+abc),求证:ac=bd.
(4)计算(y-x)(z-x)/(x+z-2y)(x+y-2z)+(z-y)/(x+y-2z)×(x-y)/(y+z-2x)+(x-z)(y-z)/(y+z-2x)(x+z-2y).
(5)已知a+b+c=0,a2+b2+c2=1,求:a4+b4+c4的值.