1.（x^2-3x-3)（x^2+3x+4)-82.(2x-7)(2x+5)(x^2-9)-913.x^4+x^2-2ax-a^2+1

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1.（x^2-3x-3)（x^2+3x+4)-82.(2x-7)(2x+5)(x^2-9)-913.x^4+x^2-2ax-a^2+1

1.（x^2-3x-3)（x^2+3x+4)-82.(2x-7)(2x+5)(x^2-9)-913.x^4+x^2-2ax-a^2+1
1.（x^2-3x-3)（x^2+3x+4)-8
2.(2x-7)(2x+5)(x^2-9)-91
3.x^4+x^2-2ax-a^2+1

1.（x^2-3x-3)（x^2+3x+4)-82.(2x-7)(2x+5)(x^2-9)-913.x^4+x^2-2ax-a^2+1
第一题的题目肯定是题材编写错误或者是你输入错误,我分析下有两种情况:
1.1（x^2+3x-3)（x^2+3x+4)-8
=(x^2+3x)^2+(x^2+3x)-12-8
=(x^2+3x)^2+(x^2+3x)-20
=(x^2+3x+5)(x^2+3x-4)
=(x^2+3x+5)(x+4)(x-1)
1.2（x^2-3x-3)（x^2-3x+4)-8
=(x^2-3x)^2+(x^2-3x)-20
=(x^2-3x+5)(x^2-3x-4)
=(x^2+3x+5)(x-4)(x+1)
2.(2x-7)(2x+5)(x^2-9)-91
=(2x-7)(x+3)(2x+5)(x-3)-91
=(2x^2-x-21)(2x^2-x-15)-91
=(2x^2-x)^2-36(2x^2-x)+315-91
=(2x^2-x)^2-36(2x^2-x)+224
=(2x^2-x-8)(2x^2-x-28)
=(2x+7)(x-4)(2x^2-x-8)
3.x^4+x^2-2ax-a^2+1
=x^4+2x^2+1-x^2-2ax-a^2
=(x^2+1)^2-(x+a)^2
=(x^2+1+x+a)(x^2+1-x-a)

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