问题
解答题
用简便方法计算. (1)
(2)
|
答案
(1)
×4+4 5
×2+2 5
×161 5
=
×4+4 5
×4+1 5
×4,4 5
=(
+4 5
+1 5
)×4,4 5
=
×4,9 5
=
;36 5
(2)
×20122012 2013
=
×(2013-1)2012 2013
=
×2013-2012 2013
,2012 2013
=2012-
,2012 2013
=2011
.1 2013