题目内容
计算下面各题,能简算的要简算
|
|
|
6-(
|
分析:(1)根据加法结合律进行计算;
(2)按照从左向右的顺序进行计算;
(3)根据加法交换律和结合律进行计算;
(4)先算小括号里面的减法,再算括号外面的减法.
(2)按照从左向右的顺序进行计算;
(3)根据加法交换律和结合律进行计算;
(4)先算小括号里面的减法,再算括号外面的减法.
解答:解:
(1)
+
+
,
=
+(
+
),
=
+1,
=1
;
(2)
+
+
,
=
+
,
=
;
(3)
+
+
+
,
=(
+
)+(
+
),
=
+1,
=1
;
(4)6-(
-
),
=6-
,
=5
.
(1)
| 1 |
| 6 |
| 1 |
| 10 |
| 9 |
| 10 |
=
| 1 |
| 6 |
| 1 |
| 10 |
| 9 |
| 10 |
=
| 1 |
| 6 |
=1
| 1 |
| 6 |
(2)
| 4 |
| 5 |
| 11 |
| 15 |
| 3 |
| 10 |
=
| 23 |
| 15 |
| 3 |
| 10 |
=
| 11 |
| 6 |
(3)
| 1 |
| 12 |
| 1 |
| 4 |
| 5 |
| 12 |
| 3 |
| 4 |
=(
| 1 |
| 12 |
| 5 |
| 12 |
| 1 |
| 4 |
| 3 |
| 4 |
=
| 1 |
| 2 |
=1
| 1 |
| 2 |
(4)6-(
| 3 |
| 4 |
| 2 |
| 5 |
=6-
| 7 |
| 20 |
=5
| 13 |
| 20 |
点评:四则运算,先弄清运算顺序,然后再进一步计算,能简算的要简算.
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