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4
5
=
7
8
×6÷
7
8
=
2
5
+6×
3
5
=
1
6
×
3
8
=
1
8
+
1
4
)×16=
5
6
=
3
10
×
4
9
=
24%×5=
分析:(1)(2)(4)(6)(7)(8)按分数乘法和除法的计算法则直接计算;(3)(5)按乘法分配律进行简算.
解答:解:(1)4÷
4
5

=4×
5
4

=5;

(2)
7
8
×6÷
7
8

=
7
8
×6×
8
7

=6;

(3)6×
2
5
+6×
3
5

=6×(
2
5
+
3
5
),
=6×1,
=6;

(4)
1
6
×
3
8
=
1
16


(5)(
1
8
+
1
4
)×16,
=
1
8
×16+
1
4
×16,
=2+4,
=6;

(6)1÷
5
6

6
5

=
6
5


(7)
3
10
×
4
9
=
2
15


(8)24%×5,
=0.24×5,
=1.2.
点评:此题考查学生的计算能力,运用法则细心计算,并注意运用定律进行简算.
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