题目内容
“计算”空间站
+
+
-
-
1-
-
.
| 5 |
| 12 |
| 3 |
| 4 |
| 1 |
| 12 |
| 7 |
| 10 |
| 3 |
| 8 |
| 1 |
| 8 |
1-
| 1 |
| 2 |
| 1 |
| 3 |
分析:(1)根据加法交换律进行简算;
(2)根据减法的性质进行简算;
(3)按照从左向右的顺序进行计算.
(2)根据减法的性质进行简算;
(3)按照从左向右的顺序进行计算.
解答:解:(1)
+
+
=
+
+
=
+
=
;
(2)
-
-
=
-(
+
)
=
-
=
;
(3)1-
-
=
-
=
.
| 5 |
| 12 |
| 3 |
| 4 |
| 1 |
| 12 |
=
| 5 |
| 12 |
| 1 |
| 12 |
| 3 |
| 4 |
=
| 1 |
| 2 |
| 3 |
| 4 |
=
| 5 |
| 4 |
(2)
| 7 |
| 10 |
| 3 |
| 8 |
| 1 |
| 8 |
=
| 7 |
| 10 |
| 3 |
| 8 |
| 1 |
| 8 |
=
| 7 |
| 10 |
| 1 |
| 2 |
=
| 1 |
| 5 |
(3)1-
| 1 |
| 2 |
| 1 |
| 3 |
=
| 1 |
| 2 |
| 1 |
| 3 |
=
| 1 |
| 6 |
点评:本题考查了基本的分数的加减混合运算,要注意分析数据,选择合适的简算方法简算.
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