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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