题目内容
计算下面各题
|
(
| ||||||||||||||
105×(
|
|
分析:(1)先算乘法,再算减法;
(2)先算括号里的加法,再算除法;
(3)直接运用乘法分配律计算即可.
(4)先算除法,最后算减法.
(2)先算括号里的加法,再算除法;
(3)直接运用乘法分配律计算即可.
(4)先算除法,最后算减法.
解答:解:(1)
-
×
=
-
,
=
;
(2)(
+
)÷
=
×
,
=
;
(3)105×(
+
+
)
=105×
+105×
+105×
,
=35+21+15,
=71;
(4)
÷
-
÷
.
=
×
-
×
,
=
-
,
=2.
| 3 |
| 5 |
| 2 |
| 5 |
| 1 |
| 3 |
=
| 3 |
| 5 |
| 2 |
| 15 |
=
| 7 |
| 15 |
(2)(
| 7 |
| 8 |
| 1 |
| 4 |
| 21 |
| 32 |
=
| 36 |
| 32 |
| 32 |
| 21 |
=
| 12 |
| 7 |
(3)105×(
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 7 |
=105×
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 7 |
=35+21+15,
=71;
(4)
| 5 |
| 7 |
| 3 |
| 14 |
| 2 |
| 7 |
| 3 |
| 14 |
=
| 5 |
| 7 |
| 14 |
| 3 |
| 2 |
| 7 |
| 14 |
| 3 |
=
| 10 |
| 3 |
| 4 |
| 3 |
=2.
点评:完成本题要细心分析题目中数据的特点,能简便计算的要简便计算.
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