问题 解答题

(x+2)(x-2)(x2+4)-(x2-4)2

答案

(x+2)(x-2)(x2+4)-(x2-4)2

=(x2-4)(x2+4)-(x4-8x2+16),

=x4-16-x4+8x2-16,

=8x2-32.

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