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(x+2)(x-2)(x2+4)的计算结果是 ( )
A.x4+16 B.-x4-16 C.x4-16 D.16-x4
(x+4)(x-4)(x2+16)的计算结果是
A.x4-256
B.x4+256
C.(x2+16)2
D.(x+16)4