题目内容
计算下面各题.
1+
|
|
|
分析:(1)先算加法,再算减法;
(2)先算加法,再算减法;
(3)先算小括号里面的减法,再算括号外面的减法.
(2)先算加法,再算减法;
(3)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
-
,
=1
;
(2)
-(
+
),
=
-
,
=
;
(3)
-(
-
),
=
-
,
=
.
(1)1+
| 1 |
| 2 |
| 1 |
| 4 |
=1
| 1 |
| 2 |
| 1 |
| 4 |
=1
| 1 |
| 4 |
(2)
| 9 |
| 10 |
| 2 |
| 5 |
| 1 |
| 4 |
=
| 9 |
| 10 |
| 13 |
| 20 |
=
| 1 |
| 4 |
(3)
| 7 |
| 8 |
| 3 |
| 4 |
| 1 |
| 2 |
=
| 7 |
| 8 |
| 1 |
| 4 |
=
| 5 |
| 8 |
点评:此题主要考查分数的四则混合运算的运算顺序,然后再进一步计算.
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