题目内容

(1)
2
3
+
3
5

(2)1
1
3
-
7
12
+
9
20
-
11
30
+
13
42
-
15
56

(3)36.785-(29-3.215)
(4)2009÷2009
2009
2010
+
1
2011
(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.
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