题目内容

用你喜欢的方法计算下面各题.
1
5
+
5
6
+
2
3
        
7
18
-(
5
18
-
1
9
)    
5
24
+
1
4
+
2
3

3
4
+
4
9
+
1
4
+
2
9
       2-
2
7
-
3
7
     
3
8
+
2
7
+
1
8
+
5
7
(1)
1
5
+
5
6
+
2
3

=
1
5
+(
5
6
+
2
3
),
=
1
5
+
3
2

=
17
10


(2)
7
18
-(
5
18
-
1
9
),
=
7
18
-
5
18
+
1
9

=
1
9
+
1
9

=
2
9


(3)
5
24
+
1
4
+
2
3

=
11
24
+
16
24

=
9
8


(4)
3
4
+
4
9
+
1
4
+
2
9

=(
3
4
+
1
4
)+(
2
9
+
4
9
),
=1+
2
3

=1
2
3


(5)2-
2
7
-
3
7

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

=1
2
7


(6)
3
8
+
2
7
+
1
8
+
5
7

=(
3
8
+
1
8
)+(
2
7
+
5
7
),
=
1
2
+1,
=1
1
2
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