题目内容
计算下面各题(写出主要的计算过程).
|
|
|
分析:(1)通分计算;
(2)(3)先算括号内的,再算括号外的,同时注意通分计算.
(2)(3)先算括号内的,再算括号外的,同时注意通分计算.
解答:解:(1)
-
,
=
-
,
=
;
(2)
+(
-
),
=
+
,
=
;
(3)
-(
+
),
=
-
,
=
.
| 5 |
| 6 |
| 3 |
| 4 |
=
| 10 |
| 12 |
| 9 |
| 12 |
=
| 1 |
| 12 |
(2)
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 4 |
=
| 2 |
| 3 |
| 1 |
| 4 |
=
| 11 |
| 12 |
(3)
| 13 |
| 15 |
| 1 |
| 3 |
| 2 |
| 5 |
=
| 13 |
| 15 |
| 11 |
| 15 |
=
| 2 |
| 15 |
点评:此题考查了学生的运算顺序,以及通分计算的能力.
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