题目内容

计算下面各题,能简算的要简算
1
2
+
3
10
-
1
5
2
3
+(
13
15
+
1
3
)
6
7
-
1
2
+
4
5
5-
3
5
-
7
5
4
9
+
6
17
+
14
9
+
11
17
3
4
-(
7
12
-
1
3
)
(1)
1
2
+
3
10
-
1
5
,
=
4
5
-
1
5
,
=
3
5
;

(2)
2
3
+(
13
15
+
1
3
),
=(
2
3
+
1
3
)+
13
15
,
=1+
13
15
,
=1
13
15
;

(3)
6
7
-
1
2
+
4
5
,
=
5
14
+
4
5
,
=
81
70
;

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

(5)
4
9
+
6
17
+
14
9
+
11
17
,
=(
4
9
+
14
9
)+(
11
17
+
6
17
),
=2+1,
=3;

(6)
3
4
-(
7
12
-
1
3
),
=
3
4
-
1
4
,
=
1
2
.
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