题目内容

7
6
-
3
5
-
1
5
5
4
-(
3
7
+
1
4
)
0.5+
1
4
-0.5+
1
4
4
5
-(
7
8
-
1
5
)
17
9
-
1
6
-
5
6
+
1
9
3
7
+
1
4
-
1
14

(1)
7
6
-
3
5
-
1
5

=
7
6
-(
3
5
+
1
5
),
=
7
6
-
4
5

=
11
30


(2)
5
4
-(
3
7
+
1
4
)

=
5
4
-
3
7
-
1
4

=
5
4
-
1
4
-
3
7

=1-
3
7

=
4
7


(3)0.5+
1
4
-0.5+
1
4

=(0.5-0.5)+(
1
4
+
1
4
),
=0+
1
2

=
1
2


(4)
4
5
-(
7
8
-
1
5
)

=
4
5
-
7
8
+
1
5

=
4
5
+
1
5
-
7
8

=1-
7
8

=
1
8


(5)
17
9
-
1
6
-
5
6
+
1
9

=(
17
9
+
1
9
)-(
1
6
+
5
6
),
=2-1,
=1;

(6)
3
7
+
1
4
-
1
14

=
3
7
-
1
14
+
1
4

=
5
14
+
1
4

=
17
28
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