题目内容
| 计算下面各题(能简算的要简算) ①
|
②
| ||||||||||||
③24×(
|
④
|
分析:①先算除法,再算乘法;
②根据乘法分配律进行简算;
③根据乘法分配律进行简算;
④根据乘法分配律进行简算.
②根据乘法分配律进行简算;
③根据乘法分配律进行简算;
④根据乘法分配律进行简算.
解答:解:
①
÷
×
,
=
×
,
=
;
②
÷7+
×
,
=
×
+
×
,
=(
+
)×
,
=
×
,
=
;
③24×(
+
-
),
=24×
+24×
-24×
,
=21+36-18,
=57-18,
=39;
④
×0.37+
×37%,
=
×0.37+
×0.37,
=(
+
)×0.37,
=1×0.37,
=0.37.
①
| 5 |
| 8 |
| 3 |
| 4 |
| 9 |
| 25 |
=
| 5 |
| 6 |
| 9 |
| 25 |
=
| 3 |
| 10 |
②
| 6 |
| 13 |
| 1 |
| 7 |
| 8 |
| 13 |
=
| 6 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 8 |
| 13 |
=(
| 6 |
| 13 |
| 8 |
| 13 |
| 1 |
| 7 |
=
| 14 |
| 13 |
| 1 |
| 7 |
=
| 2 |
| 13 |
③24×(
| 7 |
| 8 |
| 3 |
| 2 |
| 3 |
| 4 |
=24×
| 7 |
| 8 |
| 3 |
| 2 |
| 3 |
| 4 |
=21+36-18,
=57-18,
=39;
④
| 1 |
| 5 |
| 4 |
| 5 |
=
| 1 |
| 5 |
| 4 |
| 5 |
=(
| 1 |
| 5 |
| 4 |
| 5 |
=1×0.37,
=0.37.
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