题目内容
(2011?云霄县)脱式计算(带*号的要简算)
(
|
| ||||||||||||
*
|
*36×(
|
分析:(1)先算小括号里面的加法,再算除法,最后算括号外面的加法;
(2)先算减法,再算乘法,最后算除法;
(3)根据乘法分配律进行计算;
(4)根据乘法分配律进行计算.
(2)先算减法,再算乘法,最后算除法;
(3)根据乘法分配律进行计算;
(4)根据乘法分配律进行计算.
解答:解:
(1)(
+25%)÷
+0.7,
=1.05÷
+0.7,
=0.45+0.7,
=1.15;
(2)
÷〔(
-
)×
〕,
=
÷〔
×
〕,
=
÷
,
=
;
(3)
÷5+
÷2,
=
×
+
×
,
=
×(
+
),
=
×
,
=
;
(4)36×(
+
-
),
=36×
+36×
-36×
,
=48+30-27,
=51.
(1)(
4 |
5 |
7 |
3 |
=1.05÷
7 |
3 |
=0.45+0.7,
=1.15;
(2)
3 |
5 |
7 |
6 |
1 |
2 |
1 |
2 |
=
3 |
5 |
2 |
3 |
1 |
2 |
=
3 |
5 |
1 |
3 |
=
9 |
5 |
(3)
7 |
8 |
7 |
8 |
=
7 |
8 |
1 |
5 |
7 |
8 |
1 |
2 |
=
7 |
8 |
1 |
5 |
1 |
2 |
=
7 |
8 |
7 |
10 |
=
49 |
80 |
(4)36×(
4 |
3 |
5 |
6 |
3 |
4 |
=36×
4 |
3 |
5 |
6 |
3 |
4 |
=48+30-27,
=51.
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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