问题 解答题
怎样算便怎样算:
7
9
÷
11
5
+
2
9
×
5
11
 
2
5
÷(
3
4
+
2
5
1
8
+
1
4
)×4
7
8
×
5
7
÷
7
8
×
5
7
7
8
+
13
16
)÷
13
16
2008×
2006
2007
2
3
+(
4
7
+
1
2
)×
7
25
答案

(1)

7
9
÷
11
5
+
2
9
×
5
11
 

=

7
9
×
5
11
+
2
9
×
5
11
 

=(

7
9
+
2
9
)×
5
11
 

=1×

5
11
 

=

5
11

(2)

2
5
÷(
3
4
+
2
5

=

2
5
÷
23
20

=

2
5
×
20
23

=

8
23

(3)(

1
8
+
1
4
)×4

=

1
8
×4+
1
4
×4

=

1
2
+1

=1

1
2

(4)

7
8
×
5
7
÷
7
8
×
5
7

=

7
8
×
5
7
×
8
7
×
5
7

=(

7
8
×
8
7
)×(
5
7
×
5
7

=1×

25
49

=

25
49

(5)(

7
8
+
13
16
)÷
13
16

=

27
16
×
16
13

=

27
13

(6)2008×

2006
2007

=(2007+1)×

2006
2007

=2007×

2006
2007
+
2006
2007

=2006+

2006
2007

=2006

2006
2007

(7)

2
3
+(
4
7
+
1
2
)×
7
25

=

2
3
+
15
14
×
7
25

=

2
3
+
3
10

=

29
30

计算题
判断题