分解因式:(1)x4+4 (2)x8+x4+1 (3)x4-23x2y2+y4 (4)x4+x2y2+y4(5) (m2+7m+1)(m2+7m+3)-8 (6)(2x2-3x+1)2-22x2+33x-1(7)(a-1)(a-2)(a-3)(a-4)+1 (8)(a+b-2ab)(a+b-2)+(1-ab)2(9)4(2x2-x+1)(x2-2x+3)-(3x2-3x+4)2 (10)(2x-7)(2x+5)(x2-9)-91 (11)(x+5)4+(x+3)4-8

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