题目内容
计算.
|
3-
|
|
|
分析:(1)(3)按照先算括号里面的,再算括号外面的顺序计算即可解答,
(2)(4)按照从左到右顺序计算即可解答.
(2)(4)按照从左到右顺序计算即可解答.
解答:解:(1)
-(
+
),
=
-
,
=
;
(2)3-
-
,
=2
-
,
=2
;
(3)
+(1-
),
=
+
,
=1
;
(4)
-
+
,
=
+
,
=
.
| 25 |
| 28 |
| 2 |
| 7 |
| 5 |
| 14 |
=
| 25 |
| 28 |
| 9 |
| 14 |
=
| 1 |
| 4 |
(2)3-
| 1 |
| 3 |
| 1 |
| 2 |
=2
| 2 |
| 3 |
| 1 |
| 2 |
=2
| 1 |
| 6 |
(3)
| 5 |
| 8 |
| 1 |
| 4 |
=
| 5 |
| 8 |
| 3 |
| 4 |
=1
| 3 |
| 8 |
(4)
| 7 |
| 8 |
| 2 |
| 3 |
| 1 |
| 6 |
=
| 5 |
| 24 |
| 1 |
| 6 |
=
| 3 |
| 8 |
点评:能依据四则运算顺序正确进行计算是本题考查知识点,注意计算结果的准确性.
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