问题 解答题
计算.
8
9
÷
4
5
÷
8
3

4
15
÷
16
5
÷
7
3

1.8÷
9
7
÷
2
5

7
11
÷[
2
5
-(1-
7
10
)]
答案

(1)

8
9
÷
4
5
÷
8
3

=

8
9
×
5
4
×
3
8

=

5
12

(2)

4
15
÷
16
5
÷
7
3

=

4
15
×
5
16
×
3
7

=

1
28

(3)1.8÷

9
7
÷
2
5

=1.8×

7
9
×
5
2

=3.5;

(4)

7
11
÷[
2
5
-(1-
7
10
)],

=

7
11
÷[
2
5
-
3
10
],

=

7
11
÷
1
10

=

7
11
×10,

=

70
11

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