题目内容
脱式计算.
| (
|
| ||||||||||||||||||||
48×(
| 4÷
|
|
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)根据乘法分配律进行简算;
(2)根据乘法分配律进行简算;
(3)先算除法,再算加法;
(4)根据乘法分配律进行简算;
(5)根据除法的性质进行简算;
(6)先算减法,再算乘法.
(2)根据乘法分配律进行简算;
(3)先算除法,再算加法;
(4)根据乘法分配律进行简算;
(5)根据除法的性质进行简算;
(6)先算减法,再算乘法.
解答:
解:(1)
×
+
×
=(
+
)×
=1×
=
;
(2)(
+
+
)×18
=
×18+
×18+
×18
=9+6+3
=15+3
=18;
(3)
+
÷
=
+2
=2
;
(4)48×(
+
)
=48×
+48×
=6+8
=14;
(5)4÷
÷
=4÷(
×
)
=4÷
=
;
(6)
×(
-
)
=
×
=
.
3 |
7 |
1 |
3 |
4 |
7 |
1 |
3 |
=(
3 |
7 |
4 |
7 |
1 |
3 |
=1×
1 |
3 |
=
1 |
3 |
(2)(
1 |
2 |
1 |
3 |
1 |
6 |
=
1 |
2 |
1 |
3 |
1 |
6 |
=9+6+3
=15+3
=18;
(3)
1 |
4 |
3 |
4 |
3 |
8 |
=
1 |
4 |
=2
1 |
4 |
(4)48×(
1 |
8 |
1 |
6 |
=48×
1 |
8 |
1 |
6 |
=6+8
=14;
(5)4÷
5 |
3 |
9 |
20 |
=4÷(
5 |
3 |
9 |
20 |
=4÷
3 |
4 |
=
16 |
3 |
(6)
3 |
10 |
5 |
7 |
10 |
21 |
=
3 |
10 |
5 |
21 |
=
1 |
14 |
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定律简便计算.
练习册系列答案
相关题目
从上面看,哪一个物体的形状是?( )
A、 |
B、 |
C、 |
D、 |