求因式分解的答案：
1.x^4-11x^2y^2+y^2
2.x^4-12x+323
3.a^3+b^3+c^3-3abc
4.x^4+7x^3+14x^2+7x+1
5.(x+y)^3+2xy(1-x-y)-1
6.x^3+x^2+10x-6
7.x^4+3x^3-3x^2-12x-4
8.4x^4+4x^3-9x^2-x+2
9.2x^3-13x^2+25x-14
10.ac(c-a)+bc(b-c)+ab(a-b)
11.a^4+b^4+c^4-2a^2b^2-2b^2c^2-2c^2a^2
12.x(y+z)^2+y(z+x)^2+z(x+y)^2-4xyz