题目内容
(2012?海港区)脱式计算
(
|
9÷[1-(
|
1.02÷(5+0.4×0.25) |
分析:(1)先算括号里面的加法,再算括号外面的除法,最后算括号外面的加法,
(2)先算小括号里面的,再算中括号里面的,最后算除法,
(3)先算括号里面的乘法,再算加法,最后算括号外面的除法.
(2)先算小括号里面的,再算中括号里面的,最后算除法,
(3)先算括号里面的乘法,再算加法,最后算括号外面的除法.
解答:解:(1)(
+
)÷
+
,
=
×
+
,
=
+
,
=
;
(2)9÷[1-(
+
)],
=9÷[1-
],
=9÷
,
=27;
(3)1.02÷(5+0.4×0.25),
=1.02÷(5+0.1),
=1.02÷5.1,
=0.2.
4 |
5 |
1 |
4 |
7 |
3 |
7 |
10 |
=
21 |
20 |
3 |
7 |
7 |
10 |
=
9 |
20 |
7 |
10 |
=
23 |
20 |
(2)9÷[1-(
1 |
2 |
1 |
6 |
=9÷[1-
2 |
3 |
=9÷
1 |
3 |
=27;
(3)1.02÷(5+0.4×0.25),
=1.02÷(5+0.1),
=1.02÷5.1,
=0.2.
点评:本题主要考查了学生四则运算的计算能力.
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