题目内容
脱式计算.
+
-
+
-
+(
-
)
| 5 |
| 7 |
| 3 |
| 4 |
| 9 |
| 14 |
| 3 |
| 4 |
| 5 |
| 6 |
| 5 |
| 8 |
| 5 |
| 9 |
| 5 |
| 4 |
| 1 |
| 2 |
考点:分数的四则混合运算,分数的简便计算
专题:运算顺序及法则,运算定律及简算
分析:(1)(2)根据加法交换律简算;
(3)先算小括号里面的减法,再算括号外的加法.
(3)先算小括号里面的减法,再算括号外的加法.
解答:
解:(1)
+
-
=
-
+
=
+
=
;
(2)
+
-
=
-
+
=
+
=
;
(3)
+(
-
)
=
+
=
.
| 5 |
| 7 |
| 3 |
| 4 |
| 9 |
| 14 |
=
| 5 |
| 7 |
| 9 |
| 14 |
| 3 |
| 4 |
=
| 1 |
| 14 |
| 3 |
| 4 |
=
| 23 |
| 28 |
(2)
| 3 |
| 4 |
| 5 |
| 6 |
| 5 |
| 8 |
=
| 3 |
| 4 |
| 5 |
| 8 |
| 5 |
| 6 |
=
| 1 |
| 8 |
| 5 |
| 6 |
=
| 23 |
| 24 |
(3)
| 5 |
| 9 |
| 5 |
| 4 |
| 1 |
| 2 |
=
| 5 |
| 9 |
| 3 |
| 4 |
=
| 47 |
| 36 |
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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