题目内容
计算,能简算的要简算.
|
|
|
分析:(1)按照从左向右的顺序计算;
(2)根据乘法分配律进行计算;
(3)先算加法,再算乘法,最后算除法.
(2)根据乘法分配律进行计算;
(3)先算加法,再算乘法,最后算除法.
解答:解:
(1)
÷0.6×
,
=
×
,
=
;
(2)
÷9+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(3)
÷[(
+0.4)×
],
=
÷[
×
],
=
÷
,
=3.
(1)
| 18 |
| 35 |
| 2 |
| 3 |
=
| 6 |
| 7 |
| 2 |
| 3 |
=
| 4 |
| 7 |
(2)
| 5 |
| 17 |
| 1 |
| 9 |
| 12 |
| 17 |
=
| 5 |
| 17 |
| 1 |
| 9 |
| 1 |
| 9 |
| 12 |
| 17 |
=(
| 5 |
| 17 |
| 12 |
| 17 |
| 1 |
| 9 |
=1×
| 1 |
| 9 |
=
| 1 |
| 9 |
(3)
| 4 |
| 5 |
| 1 |
| 3 |
| 4 |
| 11 |
=
| 4 |
| 5 |
| 11 |
| 15 |
| 4 |
| 11 |
=
| 4 |
| 5 |
| 4 |
| 15 |
=3.
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律简便计算.
练习册系列答案
相关题目