题目内容
用合适的方法计算下列各题.
54×(
|
|
1
| ||||||||||||||||||
|
|
(
|
考点:分数的四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:(1)根据乘法分配律进行简算;
(2)先算乘法,再算加法;
(3)根据减法的性质以及加法交换律和结合律进行简算;
(4)按照从左向右的顺序进行计算;
(5)按照从左向右的顺序进行计算;
(6)先算加法,再算乘法.
(2)先算乘法,再算加法;
(3)根据减法的性质以及加法交换律和结合律进行简算;
(4)按照从左向右的顺序进行计算;
(5)按照从左向右的顺序进行计算;
(6)先算加法,再算乘法.
解答:
解:(1)54×(
-
)
=54×
-54×
=45-8
=37;
(2)
×33+
=12+
=12
;
(3)1
-
+
-
=(1
+
)-(
+
)
=2-1
=1;
(4)
×
÷
=
÷
=
;
(5)
÷
×
=
×
=
;
(6)(
+
)×
=
×
=
.
| 5 |
| 6 |
| 4 |
| 27 |
=54×
| 5 |
| 6 |
| 4 |
| 27 |
=45-8
=37;
(2)
| 4 |
| 11 |
| 4 |
| 11 |
=12+
| 4 |
| 11 |
=12
| 4 |
| 11 |
(3)1
| 7 |
| 8 |
| 3 |
| 4 |
| 1 |
| 8 |
| 1 |
| 4 |
=(1
| 7 |
| 8 |
| 1 |
| 8 |
| 3 |
| 4 |
| 1 |
| 4 |
=2-1
=1;
(4)
| 7 |
| 10 |
| 5 |
| 16 |
| 13 |
| 32 |
=
| 7 |
| 32 |
| 13 |
| 32 |
=
| 7 |
| 13 |
(5)
| 2 |
| 13 |
| 15 |
| 26 |
| 5 |
| 8 |
=
| 4 |
| 15 |
| 5 |
| 8 |
=
| 1 |
| 6 |
(6)(
| 2 |
| 3 |
| 1 |
| 4 |
| 21 |
| 11 |
=
| 11 |
| 12 |
| 21 |
| 11 |
=
| 7 |
| 6 |
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