Phân tích đa thức thành nhân tử:
1) \(x^8+3x^4+4\)
2) \(x^6-x^4-2x^3+2x^2\)
3)\(2a^2b+4ab^2-a^2c+ac^2-4b^2c+2bc^2-4abc\)
4)\(x^4+2007x^2+2006x+2007\)
5)\(a^3+b^3+c^3-3abc\)
6)\(\left(a-x\right)y^3-\left(a-y\right)x^3+\left(x-y\right)a^3\)
7)\(bc\left(b+c\right)+ca\left(c-a\right)+ba\left(a+b\right)+2abc\)
8)\(x^2y+xy^2+x^2z+xz^2+y^2z+yz^2+2xyz\)
9) \(9x^2-64-12xy+4y^2\)
10) \(6x^2-7x-20\)