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(1)0.28÷
7
15
(2)5.6-2
2
3
(3)1
1
6
×0.54
(4)3
3
4
-(2
1
6
-
1
4
)
(5)3.6-3
2
7
+5
2
5
(6)19
1
9
-2
3
8
-2.625
分析:(1)先把被除数化成假分数,再根据分数除法的计算法则:除以一个不为0的数,就等于乘这个数的倒数;
(2)把5.6化为带分数,然后通分,进而得出结论;
(3)把带分数化为假分数,然后根据分数乘小数的计算方法解答;
(4)去括号,然后先计算3
3
4
+
1
4
,然后减去2
1
6
即可;
(5)可以进行简算:先算3.6+5
2
5
,然后减去3
2
7
即可;
(6)运用减法的性质,进行简算即可.
解答:解:(1)0.28÷
7
15

=
7
25
÷
7
15

=
7
25
×
15
7

=
3
5


(2)5.6-2
2
3

=5
3
5
-2
2
3

=5
9
15
-2
10
15

=2
14
15


(3)1
1
6
×0.54

=
7
6
×0.54,
=0.63;

(4)3
3
4
-(2
1
6
-
1
4
)

=3
3
4
-2
1
6
+
1
4

=3
3
4
+
1
4
-2
1
6

=1
5
6


(5)3.6-3
2
7
+5
2
5

=3.6+5
2
5
-3
2
7

=5
5
7


(6)19
1
9
-2
3
8
-2.625

=19
1
9
-(2
3
8
+2.625),
=19
1
9
-5,
=14
1
9
点评:此题考查了分数、小数四则混合运算,应熟练掌握运算的方法,灵活运用一些运算定律使计算简便.
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