问题 解答题
5
8
÷
20
21
÷
7
12
3
4
×(
17
18
-
5
9
4×[(
5
6
+
2
3
)÷6]
3
7
×
1
15
+
4
7
÷15
(6-
1
8
×32)+
3
4
4
5
÷
5
8
-
1
2
÷
5
8
答案

5
8
÷
20
21
÷
7
12

=

5
8
×
21
20
×
12
7

=

9
8

3
4
×(
17
18
-
5
9

=

3
4
×(
17
18
-
10
18
),

=

3
4
×
7
18

=

7
24

4×[(

5
6
+
2
3
)÷6]

=4×[(

5
6
+
4
6
)×
1
6
],

=4×[

9
6
×
1
6
],

=4×

1
4

=1;

3
7
×
1
15
+
4
7
÷15

=

3
7
×
1
15
+
4
7
×
1
15

=(

3
7
+
4
7
)×
1
15

=1×

1
15

=

1
15

(6-

1
8
×32)+
3
4

=(6-4)+

3
4

=2+

3
4

=2

3
4

4
5
÷
5
8
-
1
2
÷
5
8

=

4
5
×
8
5
-
1
2
×
8
5

=(

4
5
-
1
2
)×
8
5

=(

8
10
-
5
10
)×
8
5

=

3
10
×
8
5

=

12
25

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