题目内容
下面各题怎样计算简便就怎样计算.
12÷
|
|
| ||||||||||||||
(
| 12×(
| 27×
|
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)按照从左向右的顺序进行计算;
(2)按照从左向右的顺序进行计算;
(3)先算除法,再算减法;
(4)先算加法,再算除法;
(5)根据乘法分配律进行简算;
(6)根据乘法分配律进行简算.
(2)按照从左向右的顺序进行计算;
(3)先算除法,再算减法;
(4)先算加法,再算除法;
(5)根据乘法分配律进行简算;
(6)根据乘法分配律进行简算.
解答:
解:(1)12÷
÷
=15÷
=40;
(2)
÷
×
=3×
=
;
(3)
÷2-
=
-
=
;
(4)(
+
)÷
=
÷
=
;
(5)12×(
-
+
)
=12×
-12×
+12×
=9-6+10
=3+10
=13;
(6)27×
+27÷5
=27×
+27×
=27×(
+
)
=27×1
=27.
4 |
5 |
3 |
8 |
=15÷
3 |
8 |
=40;
(2)
3 |
8 |
1 |
8 |
4 |
5 |
=3×
4 |
5 |
=
12 |
5 |
(3)
6 |
7 |
3 |
14 |
=
3 |
7 |
3 |
14 |
=
3 |
14 |
(4)(
1 |
6 |
1 |
2 |
6 |
7 |
=
2 |
3 |
6 |
7 |
=
7 |
9 |
(5)12×(
3 |
4 |
1 |
2 |
5 |
6 |
=12×
3 |
4 |
1 |
2 |
5 |
6 |
=9-6+10
=3+10
=13;
(6)27×
4 |
5 |
=27×
4 |
5 |
1 |
5 |
=27×(
4 |
5 |
1 |
5 |
=27×1
=27.
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.
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