问题
解答题
(1)
(2)1
(3)36.785-(29-3.215) (4)2009÷2009
|
答案
(1)
+2 3
,3 5
=
+10 15
,9 15
=
,19 15
=1
;4 15
(2)1
-1 3
+7 12
-9 20
+11 30
-13 42
,15 56
=(
+4 3
+9 20
)-(13 42
+7 12
+11 30
),15 56
=(
+560 420
+189 420
)-(130 420
+490 840
+308 840
),225 840
=
-879 420
,1023 840
=
-1758 840
,1023 840
=
,735 840
=
;7 8
(3)(3)36.785-(29-3.215),
=36.785+3.215-29,
=40-29,
=11;
(4)2009÷2009
+2009 2010
,1 2011
=2009÷
+2009×2010+2009 2010
,1 2011
=2009÷
+2009×2011 2010
,1 2011
=2009×
+2010 2009×2011
,1 2011
=
+2010 2011
,1 2011
=1.