题目内容

计算下面各题.
7
5
×
3
14
×
10
27
12÷
8
9
×
8
15
21
24
÷
14
8
×
4
3
15
8
÷
6
25
÷
5
16
6
7
×42×
13
18
11
16
×
8
9
÷
44
27
.
分析:(1)(4)(5)(6)按照从左到右的顺序计算;
(2)(3)先把除法变成乘法,再运用乘法结合律简算.
解答:解:(1)
7
5
×
3
14
×
10
27
,
=
3
10
×
10
27
,
=
1
9
;

(2)12÷
8
9
×
8
15
,
=12×
9
8
×
8
15
,
=12×(
9
8
×
8
15
),
=12×
3
5
,
=
36
5
;

(3)
21
24
÷
14
8
×
4
3
,
=
21
24
×
8
14
×
4
3
,
=
1
2
×
4
3
,
=
2
3
;

(4)
15
8
÷
6
25
÷
5
16
,
=
15
8
×
16
5
×
25
6
,
=6×
25
6
,
=25;

(5)
6
7
×42×
13
18
,
=36×
13
18
,
=26;

(6)
11
16
×
8
9
÷
44
27
,
=
11
18
×
27
44
,
=
3
8
.
点评:本题主要考查了分数乘除法的混合运算,找清运算顺序,合理利用所学的运算定律进行简算.
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