问题
解答题
3+
2008÷
|
答案
(1)3+
,5
+7 5 36 9
-1 4 1 9
=3+
,5
+7 5 36 9 5 36
=3+
,5 16 5 36
=3+
,5 16× 36 5
=3+
,5 576 5
=3+
,25 576
=3
;25 576
(2)2008÷
,2007 2009
=2008×
,2009 2007
=(2007+1)×
,2009 2007
=2007×
+2009 2007
,2009 2007
=2009+1
,2 2007
=2010
.2 2007