问题 解答题
计算下列各题
5
6
×
12
21
×
7
15

(1+
3
8
)×12  
5
11
-
3
11

5
4
÷
3
4
×
9
25

22÷(
1
5
+
1
6
)  
9
17
÷8+
8
17
÷8.
答案

(1)

5
6
×
12
21
×
7
15

=

5
6
×(
12
21
×
7
15
),

=

5
6
×
4
15

=

2
9

(2)(1+

3
8
)×12,

=1×12+

3
8
×12,

=12+4.5,

=16.5;

(3)5÷

5
11
-
3
11

=11-

3
11

=10

8
11

(4)

5
4
÷
3
4
×
9
25

=

5
3
×
9
25

=

3
5

(5)22÷(

1
5
+
1
6
),

=22÷

11
30

=60;

(6)

9
17
÷8+
8
17
÷8,

=(

9
17
+
8
17
)÷8,

=1÷8,

=

1
8

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