题目内容
计算:
1-
+
+
+
2
+
+
.
1-
| 1 |
| 2 |
| 1 |
| 3 |
| 2 |
| 3 |
| 2 |
| 5 |
| 1 |
| 3 |
2
| 4 |
| 8 |
| 1 |
| 8 |
| 1 |
| 2 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)(3)按照从左到右顺序甲数解答,
(2)运用加法交换律解答.
(2)运用加法交换律解答.
解答:
解:(1)1-
+
=
+
=
;
(2)
+
+
=
+
+
=1+
=1
;
(3)2
+
+
=2
+
=3
.
| 1 |
| 2 |
| 1 |
| 3 |
=
| 1 |
| 2 |
| 1 |
| 3 |
=
| 5 |
| 6 |
(2)
| 2 |
| 3 |
| 2 |
| 5 |
| 1 |
| 3 |
=
| 2 |
| 3 |
| 1 |
| 3 |
| 2 |
| 5 |
=1+
| 2 |
| 5 |
=1
| 2 |
| 5 |
(3)2
| 4 |
| 8 |
| 1 |
| 8 |
| 1 |
| 2 |
=2
| 5 |
| 8 |
| 1 |
| 2 |
=3
| 1 |
| 8 |
点评:(1)依据四则运算计算方法正确进行计算,(2)正确运用简便方法解决问题,是本题考查知识点.
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