(-8)2006+(-8)2005能被下列数整除的是( )
A. 3
B. 5
C. 7
D. 9
人气:209 ℃ 时间:2019-09-18 02:07:29
解答
(-8)2006+(-8)2005,
=(-8)(-8)2005+(-8)2005,
=(-8+1)(-8)2005,
=-7×(-8)2005
=7×82005.
所以能被7整除.
故选C.
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