题目内容
下面各题,能简算的要简算.
|
|
(
|
|
分析:(1)按照从左向右的顺序进行计算;
(2)先算加法,再算减法;
(3)根据加法交换律和结合律进行计算;
(4)根据加法交换律和结合律进行计算.
(2)先算加法,再算减法;
(3)根据加法交换律和结合律进行计算;
(4)根据加法交换律和结合律进行计算.
解答:解:
(1)
+
+
,
=
+
,
=
;
(2)
-(
+
),
=
-
,
=
;
(3)(
+
)+
,
=(
+
)+
,
=1+
,
=1
;
(4)
+
-
+
,
=(
-
)+(
+
),
=1.
(1)
| 4 |
| 5 |
| 11 |
| 15 |
| 3 |
| 10 |
=
| 23 |
| 15 |
| 3 |
| 10 |
=
| 11 |
| 6 |
(2)
| 4 |
| 5 |
| 1 |
| 8 |
| 1 |
| 4 |
=
| 4 |
| 5 |
| 3 |
| 8 |
=
| 17 |
| 40 |
(3)(
| 3 |
| 8 |
| 4 |
| 7 |
| 5 |
| 8 |
=(
| 3 |
| 8 |
| 5 |
| 8 |
| 4 |
| 7 |
=1+
| 4 |
| 7 |
=1
| 4 |
| 7 |
(4)
| 4 |
| 15 |
| 7 |
| 9 |
| 4 |
| 15 |
| 2 |
| 9 |
=(
| 4 |
| 15 |
| 4 |
| 15 |
| 7 |
| 9 |
| 2 |
| 9 |
=1.
点评:分析好算式中的数据,选择合适的方法进行计算.
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