题目内容
计算:
2÷7×
+
-
+
×
+
×
.
2÷7×
| 2 |
| 7 |
| 3 |
| 5 |
| 2 |
| 5 |
| 3 |
| 5 |
| 2 |
| 5 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 3 |
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:根据四则混合运算的运算顺序计算即可.
解答:
解:①2÷7×
=
×
=
②
+
-
+
=1-
+
=
③
×
+
×
=
+
=
| 2 |
| 7 |
=
| 2 |
| 7 |
| 2 |
| 7 |
=
| 4 |
| 49 |
②
| 3 |
| 5 |
| 2 |
| 5 |
| 3 |
| 5 |
| 2 |
| 5 |
=1-
| 3 |
| 5 |
| 2 |
| 5 |
=
| 4 |
| 5 |
③
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 3 |
=
| 1 |
| 6 |
| 1 |
| 6 |
=
| 1 |
| 3 |
点评:完成本题要注意分析式中数据,按照四则混合运算顺序的方法计算.
练习册系列答案
相关题目