问题 解答题
下面各题,怎样简便就怎样算
1
2
÷
5
4
÷
2
15
( 
7
9
+
5
27
)×54
14÷(
3
4
×
21
5
5
6
×
7
8
+
5
6
×
1
8
3
85
×86
3
5
+
3
10
)÷
7
10
答案

(1)
1
2
÷
5
4
÷
2
15

=

1
2
×
4
5
×
15
2

=3;

(2)( 

7
9
+
5
27
)×54,
=
7
9
×54+
5
27
×54,

=42+10,

=52;

(3)14÷(

3
4
×
21
5
),

=14÷

63
20

=14×

20
63

=

40
9

(4)

5
6
×
7
8
+
5
6
×
1
8

=

5
6
×(
7
8
+
1
8
),

=

5
6

(5)

3
85
×86,

=

3
85
×85+
3
85

=3

3
85

(6)(

3
5
+
3
10
)÷
7
10

=

9
10
×
10
7

=

9
7

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