题目内容
(2012?广元模拟)
脱式计算. 3.7×99+3.7 |
9.6-11÷7+
| ||||||||||
12×[(
|
12×(
|
分析:(1)根据乘法分配律进行计算,
(2)先把11÷7转化为乘法,再根据乘法分配律进行计算,
(3)先根据乘法分配律算括号里面的,
(4)根据乘法分配律进行计算.
(2)先把11÷7转化为乘法,再根据乘法分配律进行计算,
(3)先根据乘法分配律算括号里面的,
(4)根据乘法分配律进行计算.
解答:解:(1)3.7×99+3.7,
=3.7×(99+1),
=3.7×100,
=370;
(2)9.6-11÷7+
×4,
=9.6-11×
+
×4,
=9.6-(11-4)×
,
=9.6-7×
,
=9.6-1,
=8.6;
(3)12×[(
-
)×3],
=12×[
×3-
×3],
=12×[
-2],
=12×3.5,
=42;
(4)12×(
+
-
),
=12×
+12×
-12×
,
=
+2-4,
=3
.
=3.7×(99+1),
=3.7×100,
=370;
(2)9.6-11÷7+
1 |
7 |
=9.6-11×
1 |
7 |
1 |
7 |
=9.6-(11-4)×
1 |
7 |
=9.6-7×
1 |
7 |
=9.6-1,
=8.6;
(3)12×[(
11 |
6 |
2 |
3 |
=12×[
11 |
6 |
2 |
3 |
=12×[
11 |
2 |
=12×3.5,
=42;
(4)12×(
3 |
7 |
1 |
6 |
1 |
3 |
=12×
3 |
7 |
1 |
6 |
1 |
3 |
=
36 |
7 |
=3
1 |
7 |
点评:本题主要考查了学生对乘法分配律的应用情况,注意计算结果的准确性.
练习册系列答案
相关题目