题目内容
计算,能简算的要简算. 75×
|
13.7-1.4+0.6 |
| ||||||||||||
2012×
|
66-195÷3+1498 | (
|
分析:(1)先把除法变成乘法,再运用乘法分配律简算;
(2)按照从左到右的顺序计算;
(3)先算小括号里面的减法,再算括号外的乘法,最后算加法;
(4)先把2012分解2011+1,再运用乘法分配律简算;
(5)先算除法,再算减法,最后算加法;
(6)运用乘法分配律简算.
(2)按照从左到右的顺序计算;
(3)先算小括号里面的减法,再算括号外的乘法,最后算加法;
(4)先把2012分解2011+1,再运用乘法分配律简算;
(5)先算除法,再算减法,最后算加法;
(6)运用乘法分配律简算.
解答:解:(1)75×
+25÷
,
=75×
+25×
,
=(75+25)×
,
=100×
,
=60;
(2)13.7-1.4+0.6,
=12.3+0.6,
=12.9;
(3)
+
×(
-
),
=
+
×2,
=
+
,
=
;
(4)2012×
,
=(2011+1)×
,
=2011×
+1×
,
=2010+
,
=2010
;
(5)66-195÷3+1498,
=66-65+1498,
=1+1498,
=1499;
(6)(
+
)×40,
=
×40+
×40,
=25+28,
=53.
3 |
5 |
5 |
3 |
=75×
3 |
5 |
3 |
5 |
=(75+25)×
3 |
5 |
=100×
3 |
5 |
=60;
(2)13.7-1.4+0.6,
=12.3+0.6,
=12.9;
(3)
1 |
12 |
11 |
12 |
5 |
2 |
1 |
2 |
=
1 |
12 |
11 |
12 |
=
1 |
12 |
22 |
12 |
=
23 |
12 |
(4)2012×
2010 |
2011 |
=(2011+1)×
2010 |
2011 |
=2011×
2010 |
2011 |
2010 |
2011 |
=2010+
2010 |
2011 |
=2010
2010 |
2011 |
(5)66-195÷3+1498,
=66-65+1498,
=1+1498,
=1499;
(6)(
5 |
8 |
7 |
10 |
=
5 |
8 |
7 |
10 |
=25+28,
=53.
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
练习册系列答案
相关题目