题目内容
计算下面各题.(能简算的要简算.)
|
|
|
分析:(1)按照从左到右的顺序计算;
(2)先算小括号里面的加法,再算括号外的除法;
(3)先把除法变成乘法,再运用乘法分配律简算.
(2)先算小括号里面的加法,再算括号外的除法;
(3)先把除法变成乘法,再运用乘法分配律简算.
解答:解:(1)
÷
×
=
×
=
;
(2)
÷(
+
)
=
÷
=
;
(3)
÷
+
÷
=
×
+
×
=(
+
)×
=1×
=
.
| 5 |
| 16 |
| 5 |
| 8 |
| 3 |
| 4 |
=
| 1 |
| 2 |
| 3 |
| 4 |
=
| 3 |
| 8 |
(2)
| 14 |
| 15 |
| 1 |
| 5 |
| 1 |
| 2 |
=
| 14 |
| 15 |
| 7 |
| 10 |
=
| 4 |
| 3 |
(3)
| 1 |
| 4 |
| 5 |
| 8 |
| 3 |
| 4 |
| 5 |
| 8 |
=
| 1 |
| 4 |
| 8 |
| 5 |
| 3 |
| 4 |
| 8 |
| 5 |
=(
| 1 |
| 4 |
| 3 |
| 4 |
| 8 |
| 5 |
=1×
| 8 |
| 5 |
=
| 8 |
| 5 |
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
练习册系列答案
相关题目