题目内容

细心算
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)
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

=1
3
8


(4)
4
7
+
2
9
-
4
7

=
4
7
-
4
7
+
2
9

=0+
2
9

=
2
9


(5)1-
1
6
-
5
6

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