题目内容
计算下面各题,能简算的要简算.
|
|
|
|
分析:(1)运用减法性质即可解答,
(2)(4)按照从左到右顺序即可解答,
(3)按照先算括号里面的,再算括号外面的顺序即可解答.
(2)(4)按照从左到右顺序即可解答,
(3)按照先算括号里面的,再算括号外面的顺序即可解答.
解答:解:(1)
-(
-
)
=
+
-
=1-
=
;
(2)
+
+
=
+
=1
;
(3)
+(
-
)
=
+
=
;
(4)
-
-
=
-
=
.
| 4 |
| 5 |
| 1 |
| 3 |
| 1 |
| 5 |
=
| 4 |
| 5 |
| 1 |
| 5 |
| 1 |
| 3 |
=1-
| 1 |
| 3 |
=
| 2 |
| 3 |
(2)
| 3 |
| 10 |
| 2 |
| 5 |
| 9 |
| 10 |
=
| 7 |
| 10 |
| 9 |
| 10 |
=1
| 3 |
| 5 |
(3)
| 1 |
| 2 |
| 5 |
| 6 |
| 3 |
| 4 |
=
| 1 |
| 2 |
| 1 |
| 12 |
=
| 7 |
| 12 |
(4)
| 27 |
| 28 |
| 1 |
| 7 |
| 9 |
| 14 |
=
| 23 |
| 28 |
| 9 |
| 14 |
=
| 5 |
| 28 |
点评:(1)运用减法性质解决问题,(2)依据四则运算顺序正确进行计算,是本题考查知识点.
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