题目内容

(1)
1
6
+
3
4
-
2
5

(2)
21
25
+
3
8
+
4
25
+
5
8

(3)1-
1
9
-
7
9

(4)
1
2
-(
3
4
-
3
8
(1)
1
6
+
3
4
-
2
5

=
11
12
-
2
5

=
31
60


(2)
21
25
+
3
8
+
4
25
+
5
8

=(
21
25
+
4
25
)+(
3
8
+
5
8
),
=1+1,
=2;

(3)1-
1
9
-
7
9

=1-(
1
9
+
7
9
),
=1-
8
9

=
1
9


(4)
1
2
-(
3
4
-
3
8
),
=
1
2
-
3
8

=
1
8
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