题目内容

科学合理的计算.
7
9
-
2
3
+
2
9
1
2
+
1
3
+
1
4
1
5
+
3
8
+
4
5
4
7
+
2
9
-
4
7
1-
1
6
-
5
6
1
5
+
3
8
+
4
5
(1)
7
9
-
2
3
+
2
9

=
7
9
+
2
9
-
2
3

=1-
2
3

=
1
3

(2)
1
2
+
1
3
+
1
4

=
6
12
+
4
12
+
3
12
,,
=
13
12



(3)
1
5
+
3
8
+
4
5

=
1
5
+
4
5
+
3
8

=1
3
8



(4)
4
7
+
2
9
-
4
7

=
4
7
-
4
7
+
2
9

=
2
9



(5)1-
1
6
-
5
6

=1-(
1
6
+
5
6
),
=1-1,
=0;

(6)
1
5
+
3
8
+
4
5

=
1
5
+
4
5
+
3
8

=1
3
8
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