问题 解答题
怎样简便怎样算
20.2×8-10.2÷0.125       
4×27%×2.5     
14
25
÷(
7
5
+
14
25

3
4
-
3
4
×
5
6
)÷
3
2
    
7
8
×9+
7
8

[
5
6
-(
2
5
+
1
3
)]×
5
7
答案

(1)20.2×8-10.2÷0.125

=161.6-81.6,

=80;

(2)4×27%×2.5

=4×2.5×27%,

=2.7;

(3)

14
25
÷(
7
5
+
14
25

=

14
25
÷
49
25

=

2
7

(4)(

3
4
-
3
4
×
5
6
)÷
3
2

=(

3
4
-
5
8
÷
3
2

=

1
8
×
2
3

=

1
12

(5)

7
8
×9+
7
8

=(9+1)×

7
8

=10×

7
8

=

35
4

(6)[

5
6
-(
2
5
+
1
3
)]×
5
7

=[

5
6
-
11
15
5
7

=

1
10
×
5
7

=

1
14

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