题目内容
计算下列各题(能简单的要简算): 2
|
|
(11-1
| ||||||||||||||||||||
(
|
1.5÷
|
5.25÷[(1
|
分析:本题根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的.
(
×0.75+
×0.25)÷
可根据的乘法分配律计算括号里面的算式.
(
3 |
4 |
3 |
4 |
6 |
7 |
解答:解:2
+
×1
-
=
+
×
-
,
=
+
-
,
=
+
-
,
=2
;
×[2.4-(
+
)]
=
×[
-
],
=
×
,
=
;
(11-1
)÷(1-
×1
)
=
÷(1-
×
),
=
÷(1-
),
=
×
,
=24
;
(
×0.75+
×0.25)÷
=(0.75+0.25)×
×
,
=1×
×
,
=
;
1.5÷
-(0.6+
)×1
=
×
-(
+
)×
,
=
-
×
,
=
-
,
=
;
5.25÷[(1
+1.5×
)-1
]
=5.25÷[(1.25+0.5)-1.375],
=5.25÷[1.75-1.375],
=5.25÷0.375,
=14.
2 |
5 |
3 |
4 |
2 |
3 |
7 |
10 |
=
12 |
5 |
3 |
4 |
5 |
3 |
7 |
10 |
=
12 |
5 |
5 |
4 |
7 |
10 |
=
48 |
20 |
25 |
20 |
14 |
20 |
=2
19 |
20 |
4 |
9 |
1 |
5 |
1 |
8 |
=
4 |
9 |
12 |
5 |
13 |
40 |
=
4 |
9 |
83 |
40 |
=
83 |
90 |
(11-1
1 |
5 |
2 |
5 |
1 |
2 |
=
49 |
5 |
2 |
5 |
3 |
2 |
=
49 |
5 |
3 |
5 |
=
49 |
5 |
5 |
2 |
=24
1 |
2 |
(
3 |
4 |
3 |
4 |
6 |
7 |
=(0.75+0.25)×
3 |
4 |
7 |
6 |
=1×
3 |
4 |
7 |
6 |
=
7 |
8 |
1.5÷
5 |
7 |
1 |
3 |
3 |
7 |
=
3 |
2 |
7 |
5 |
3 |
5 |
1 |
3 |
10 |
7 |
=
21 |
10 |
14 |
15 |
10 |
7 |
=
21 |
10 |
4 |
3 |
=
23 |
30 |
5.25÷[(1
1 |
4 |
1 |
3 |
3 |
8 |
=5.25÷[(1.25+0.5)-1.375],
=5.25÷[1.75-1.375],
=5.25÷0.375,
=14.
点评:本题中由于大部分算式不能进行简便计算,因此计算时要细心,注意通分约分.
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