题目内容
计算下列各题,能简便的简便计算
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考点:分数的加法和减法
专题:运算顺序及法则
分析:(1)按照从左向右的顺序进行计算;
(2)根据加法交换律进行简算;
(3)按照从左向右的顺序进行计算;
(4)根据加法交换律进行简算;
(5)按照从左向右的顺序进行计算;
(6)按照从左向右的顺序进行计算.
(2)根据加法交换律进行简算;
(3)按照从左向右的顺序进行计算;
(4)根据加法交换律进行简算;
(5)按照从左向右的顺序进行计算;
(6)按照从左向右的顺序进行计算.
解答:
解:(1)
-
+
=
+
=
;
(2)
+
+
=
+
+
=1+
=1
;
(3)1-
+
=
+
=
;
(4)
+
+
=
+
+
=1+
=1
;
(5)
+
-
=
-
=1;
(6)
-
+
=
+
=
.
| 2 |
| 5 |
| 1 |
| 6 |
| 2 |
| 3 |
=
| 7 |
| 30 |
| 2 |
| 3 |
=
| 9 |
| 10 |
(2)
| 4 |
| 9 |
| 3 |
| 4 |
| 5 |
| 9 |
=
| 4 |
| 9 |
| 5 |
| 9 |
| 3 |
| 4 |
=1+
| 3 |
| 4 |
=1
| 3 |
| 4 |
(3)1-
| 1 |
| 4 |
| 2 |
| 5 |
=
| 3 |
| 4 |
| 2 |
| 5 |
=
| 23 |
| 20 |
(4)
| 7 |
| 8 |
| 2 |
| 7 |
| 1 |
| 8 |
=
| 7 |
| 8 |
| 1 |
| 8 |
| 2 |
| 7 |
=1+
| 2 |
| 7 |
=1
| 2 |
| 7 |
(5)
| 1 |
| 2 |
| 5 |
| 6 |
| 1 |
| 3 |
=
| 4 |
| 3 |
| 1 |
| 3 |
=1;
(6)
| 8 |
| 9 |
| 5 |
| 9 |
| 1 |
| 6 |
=
| 1 |
| 3 |
| 1 |
| 6 |
=
| 1 |
| 2 |
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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