题目内容

下列各题,怎样简便就怎样算.
3
7
-
5
6
+
4
7
2
7
+
1
4
+
1
14
7
6
-(
2
5
+
3
10
9
8
+
3
7
+
7
8
+
4
7
(1)
3
7
-
5
6
+
4
7

=
3
7
+
4
7
-
5
6

=1-
5
6

=
1
6


(2)
2
7
+
1
4
+
1
14

=
8
28
+
7
28
+
2
28

=
17
28


(3)
7
6
-(
2
5
+
3
10
),
=
7
6
-
7
10

=
7
15


(4)
9
8
+
3
7
+
7
8
+
4
7

=(
9
8
+
7
8
)+(
3
7
+
4
7
),
=2+1,
=3.
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