题目内容

脱式计算,能简算的要简算
2
5
+
4
15
+
3
5
7
9
-
5
18
+
1
6
1
2
+
5
8
-
3
4
4
5
-(
2
15
+
1
3
)
1
2
-(
3
4
-
3
8
)
4
7
-
7
8
+
3
7
.
(1)
2
5
+
4
15
+
3
5
,
=(
2
5
+
3
5
)+
4
15
,
=1+
4
15
.
=1
4
15
;

(2)
7
9
-
5
18
+
1
6
,
=
14
18
-
5
18
+
3
18
,
=
14-5+3
18
.
=
2
3
;

(3)
1
2
+
5
8
-
3
4
,
=
4
8
+
5
8
-
6
8
,
=
4+5-6
8
,
=
3
8
;

(4)
4
5
-(
2
15
+
1
3
)
,
=
12
15
-(
2
15
+
5
15
)
,
=
12
15
-
7
15
,
=
1
3
;

(5)
1
2
-(
3
4
-
3
8
)
,
=
4
8
-(
6
8
-
3
8
)
,
=
4
8
-
3
8
,
=
1
8
;

(6)
4
7
-
7
8
+
3
7
,
=(
4
7
+
3
7
)-
7
8
,
=1-
7
8
,
=
1
8
.
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