题目内容
计算.
|
|
7-(
| ||||||||||||||||
5-
|
|
|
分析:(1)按照从左向右的顺序进行计算;
(2)先算小括号里面的加法,再算括号外面的加法;
(3)先算小括号里面的减法,再算括号外面的减法;
(4)根据减法的性质进行计算;
(5)根据加法结合律进行计算;
(6)先算小括号里面的减法,再算括号外面的减法.
(2)先算小括号里面的加法,再算括号外面的加法;
(3)先算小括号里面的减法,再算括号外面的减法;
(4)根据减法的性质进行计算;
(5)根据加法结合律进行计算;
(6)先算小括号里面的减法,再算括号外面的减法.
解答:解:
(1)
-
+
,
=
+
,
=
;
(2)
+(
+
),
=
+
,
=
;
(3)7-(
-
),
=7-
,
=6
;
(4)5-
-
,
=5-(
+
),
=5-1,
=4;
(5)
+
+
,
=
+(
+
),
=
+1,
=1
;
(6)
-(
-
),
=
-
,
=
.
(1)
| 5 |
| 6 |
| 1 |
| 4 |
| 1 |
| 3 |
=
| 7 |
| 12 |
| 1 |
| 3 |
=
| 11 |
| 12 |
(2)
| 23 |
| 28 |
| 13 |
| 14 |
| 2 |
| 7 |
=
| 23 |
| 28 |
| 17 |
| 14 |
=
| 57 |
| 28 |
(3)7-(
| 3 |
| 4 |
| 2 |
| 5 |
=7-
| 7 |
| 20 |
=6
| 13 |
| 20 |
(4)5-
| 3 |
| 7 |
| 4 |
| 7 |
=5-(
| 3 |
| 7 |
| 4 |
| 7 |
=5-1,
=4;
(5)
| 1 |
| 6 |
| 3 |
| 8 |
| 5 |
| 8 |
=
| 1 |
| 6 |
| 3 |
| 8 |
| 5 |
| 8 |
=
| 1 |
| 6 |
=1
| 1 |
| 6 |
(6)
| 5 |
| 9 |
| 5 |
| 6 |
| 7 |
| 12 |
=
| 5 |
| 9 |
| 1 |
| 4 |
=
| 11 |
| 36 |
点评:此题主要考查分数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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