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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