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.
(316−1) 1 2
答
(3+1)(32+1)(34+1)(38+1)
=
(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).1 2
故选D.