题目内容

计算下面各题(能简便的要简便计算)
5
13
+
5
13
+
5
13
15-5÷12-
7
12
1-
1
6
+
1
3
5
7
-(
4
7
-
10
21
)
4
11
+
3
5
+
6
11
+
2
5
7
36
+(
11
12
-
1
2
)
(1)
5
13
+
5
13
+
5
13

=
5
13
×3,
=
15
13


(2)15-5÷12-
7
12

=15-
5
12
-
7
12

=15-(
5
12
+
7
12
),
=15-1,
=14;

(3)1-
1
6
+
1
3

=
5
6
+
1
3

=
7
6


(4)
5
7
-(
4
7
-
10
21
),
=
5
7
-
4
7
+
10
21

=
1
7
+
10
21

=
13
21


(5)
4
11
+
3
5
+
6
11
+
2
5

=(
4
11
+
6
11
)+(
3
5
+
2
5
),
=
10
11
+1,
=1
10
11


(6)
7
36
+(
11
12
-
1
2
)

=
7
36
+
5
12

=
11
18
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