1
4
+2.7×25%                   
 
9
5
×11.6+18.4×
9
5

16
5
×
7
13
-60%×
7
13

7
32
×31+
7
32
12
17
×
2
3
+
2
3
÷
17
5
33
37
×38.
分析:(1)把百分數(shù)化為分數(shù),運用乘法分配律簡算;
(2)(3)(4)運用乘法分配律簡算;
(5)把除法改為乘法,運用乘法分配律簡算;
(6)把38看做37+1,運用乘法分配律簡算.
解答:解:(1)3×
1
4
+2.7×25% 
=3×
1
4
+2.7×
1
4
 
=(3+2.7)×
1
4
 
=5.7×
1
4

=
57
10
×
1
4

=
57
40
;

(2)
9
5
×11.6+18.4×
9
5

=
9
5
×(11.6+18.4)
=
9
5
×30
=54;

(3)
16
5
×
7
13
-60%×
7
13

=(
16
5
-60%)×
7
13

=(
16
5
-
3
5
)×
7
13

=
13
5
×
7
13

=
7
5
;

(4)
7
32
×31+
7
32

=
7
32
×(31+1)
=
7
32
×32
=7;

(5)
12
17
×
2
3
+
2
3
÷
17
5

=
12
17
×
2
3
+
2
3
×
5
17

=(
12
17
+
5
17
)×
2
3

=1×
2
3

=
2
3
;

(6)
33
37
×38
=
33
37
×(37+1)
=
33
37
×37+
33
37

=33+
33
37

=33
33
37
點評:此題主要考查了乘法分配律的靈活運用.
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