题目内容
递等式计算: 12×
|
1
| ||||||||||
8
|
18
|
分析:(1)按照从左到右的顺序计算;
(2)先把除法转化成乘法,再约分计算;
(3)先算乘法,再算减法;
(4)先算小括号里面的除法,再算括号外的乘法.
(2)先把除法转化成乘法,再约分计算;
(3)先算乘法,再算减法;
(4)先算小括号里面的除法,再算括号外的乘法.
解答:解:(1)12×
×
,
=9×
,
=
;
(2)1
×
÷2
,
=
×
×
,
=
;
(3)8
-
×3
,
=8
-
,
=6
;
(4)18
×(
÷2),
=
×
,
=
.
3 |
4 |
4 |
15 |
=9×
4 |
15 |
=
12 |
5 |
(2)1
1 |
6 |
4 |
7 |
2 |
3 |
=
7 |
6 |
4 |
7 |
3 |
8 |
=
1 |
4 |
(3)8
2 |
5 |
1 |
2 |
1 |
3 |
=8
2 |
5 |
5 |
3 |
=6
11 |
15 |
(4)18
1 |
3 |
10 |
33 |
=
55 |
3 |
5 |
33 |
=
25 |
9 |
点评:本题考查了简单的四则混合运算,计算时先理清楚运算顺序,根据运算顺序逐步求解即可.
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