化简(3+1)(32+1)(34+1)(38+1)得(  ) A.(38+1)2 B.(38-1)2 C.316-1 D.12(316−1)

问题描述:

化简(3+1)(32+1)(34+1)(38+1)得(  )
A. (38+1)2
B. (38-1)2
C. 316-1
D.

1
2
(316−1)

(3+1)(32+1)(34+1)(38+1)
=

1
2
(3-1)(3+1)(32+1)(34+1)(38+1)
=
1
2
(32-1)(32+1)(34+1)(38+1)
=
1
2
(34-1)(34+1)(38+1)
=
1
2
(38-1)(38+1)
=
1
2
(316−1)

故选D.