题目内容

细心算
7
9
-
2
3
+
2
9
1-
1
8
-
7
8
1
5
+
3
8
+
4
5
5
8
+
2
9
-
5
8
1-
1
10
-
9
10
5
6
+
3
8
+
1
6
(1)
7
9
-
2
3
+
2
9

=
7
9
+
2
9
-
2
3

=1-
2
3

=
1
3


(2)1-
1
8
-
7
8

=1-(
1
8
+
7
8

=1-1
=0;

(3)
1
5
+
3
8
+
4
5

=
1
5
+
4
5
+
3
8

=1+
3
8

=1
3
8


(4)
5
8
+
2
9
-
5
8

=
5
8
-
5
8
+
2
9

=
2
9


(5)1-
1
10
-
9
10

=1-(
1
10
+
9
10

=1-1
=0;

(6)
5
6
+
3
8
+
1
6

=
5
6
+
1
6
+
3
8

=1+
3
8

=1
3
8
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