题目内容

脱式计算(能简算的要简算).
(1)
5
6
+
2
9
+
7
18

(2)
2
3
-
1
4
-
1
6

(3)
3
4
+
2
5
-
11
20

(4)
7
11
+
1
2
-
3
11

(5)
3
8
+
1
4
+
5
12

(6)10-
4
15
-
4
5
(1)
5
6
+
2
9
+
7
18

=
15
18
+
4
18
+
7
18

=
19
18
+
7
18

=
13
9


(2)
2
3
-
1
4
-
1
6

=
8
12
-
3
12
-
2
12

=
5
12
-
2
12

=
1
4


(3)
3
4
+
2
5
-
11
20

=
15
20
+
8
20
-
11
20

=
23
20
-
11
20

=
3
5


(4)
7
11
+
1
2
-
3
11

=
7
11
-
3
11
+
1
2

=
4
11
+
1
2

=
19
22


(5)
3
8
+
1
4
+
5
12

=
9
24
+
6
24
+
10
24

=
15
24
+
10
24

=
25
24


(6)10-
4
15
-
4
5

=10-(
4
15
+
4
5
),
=10-1
1
15

=8
14
15
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