问题 解答题
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
答案

(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

选择题
单项选择题 B1型题