题目内容

下面各题怎样算简便就怎样算.
4
7
+
1
6
-
4
7
2-
7
9
-
2
9
3
5
+
7
8
+
2
5
5
6
-
3
10
+
1
6
-
7
10
2
5
+
1
3
+
3
5
5
12
+
5
9
-
5
12

(1)
4
7
+
1
6
-
4
7

=
4
7
-
4
7
+
1
6

=
1
6


(2)2-
7
9
-
2
9

=2-(
7
9
+
2
9
),
=2-1,
=1;

(3)
3
5
+
7
8
+
2
5

=
3
5
+
2
5
+
7
8

=1+
7
8

=1
7
8


(4)
5
6
-
3
10
+
1
6
-
7
10

=(
5
6
+
1
6
)-(
3
10
+
7
10
),
=1-1,
=0;

(5)
2
5
+
1
3
+
3
5

=
2
5
+
3
5
+
1
3

=1+
1
3

=1
1
3


(6)
5
12
+
5
9
-
5
12

=
5
12
-
5
12
+
5
9

=
5
9
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