问题 解答题
合理灵活地进行计算.
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
答案

(1)

5
8
÷
20
21
÷
7
12

=

5
8
÷(
20
21
×
7
12
),

=

5
8
÷
5
9

=1

1
8

(2)

3
4
×(
17
18
-
5
9
),

=

3
4
×
17
18
-
3
4
×
5
9

=

17
24
-
5
12

=

7
24

(3)4×[(

5
6
+
2
3
)÷6],

=4×(

3
2
÷6),

=4×

1
4

=1,

(4)

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

(5)(6-

1
8
×32 )+
3
4

=(6-4)+

3
4

=2+

3
4

=2

3
4

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