题目内容
计算下面各题.
|
|
1-
| ||||||||||||||||
|
|
1-(
|
分析:(1)、(2)、(3)、(4)按照从左向右的顺序进行计算;
(5)先算括号里面的加法,再算括号外面的减法;
(6)先算括号里面的减法,再算括号外面的减法.
(5)先算括号里面的加法,再算括号外面的减法;
(6)先算括号里面的减法,再算括号外面的减法.
解答:解:
(1)
+
-
,
=
-
,
=
;
(2)
-
+
,
=
+
,
=
;
(3)1-
+
,
=
+
,
=
;
(4)
+
-
,
=
-
,
=1;
(5)
-(
+
),
=
-
,
=
;
(6)1-(
-
),
=1-
,
=
.
(1)
| 3 |
| 4 |
| 1 |
| 6 |
| 2 |
| 3 |
=
| 11 |
| 12 |
| 2 |
| 3 |
=
| 1 |
| 4 |
(2)
| 7 |
| 8 |
| 1 |
| 4 |
| 4 |
| 9 |
=
| 5 |
| 8 |
| 4 |
| 9 |
=
| 77 |
| 72 |
(3)1-
| 1 |
| 3 |
| 2 |
| 7 |
=
| 2 |
| 3 |
| 2 |
| 7 |
=
| 20 |
| 21 |
(4)
| 1 |
| 2 |
| 4 |
| 5 |
| 3 |
| 10 |
=
| 13 |
| 10 |
| 3 |
| 10 |
=1;
(5)
| 3 |
| 5 |
| 2 |
| 15 |
| 1 |
| 3 |
=
| 3 |
| 5 |
| 7 |
| 15 |
=
| 2 |
| 15 |
(6)1-(
| 2 |
| 3 |
| 1 |
| 4 |
=1-
| 5 |
| 12 |
=
| 7 |
| 12 |
点评:先弄清分数加减法混合运算的顺序,然后再根据运算顺序进行计算.
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