题目内容
口算.
+
=
-
=
+
=
-
=
-
=
2-
=
+
+
=
-(
-
)=
| 2 |
| 3 |
| 1 |
| 5 |
| 5 |
| 6 |
| 2 |
| 3 |
| 1 |
| 6 |
| 1 |
| 2 |
| 7 |
| 10 |
| 3 |
| 5 |
| 1 |
| 4 |
| 1 |
| 5 |
2-
| 2 |
| 7 |
| 1 |
| 3 |
| 3 |
| 10 |
| 2 |
| 3 |
| 5 |
| 8 |
| 5 |
| 8 |
| 2 |
| 5 |
考点:分数的加法和减法
专题:计算题
分析:直接利用分数加减法的法则计算得出答案即可.
+
+
利用加法交换律简算;
-(
-
)利用减法的性质简算.
| 1 |
| 3 |
| 3 |
| 10 |
| 2 |
| 3 |
| 5 |
| 8 |
| 5 |
| 8 |
| 2 |
| 5 |
解答:
解:
+
=
-
=
+
=
-
=
-
=
2-
=1
+
+
=1
-(
-
)=
| 2 |
| 3 |
| 1 |
| 5 |
| 13 |
| 15 |
| 5 |
| 6 |
| 2 |
| 3 |
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 2 |
| 2 |
| 3 |
| 7 |
| 10 |
| 3 |
| 5 |
| 1 |
| 10 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 20 |
2-
| 2 |
| 7 |
| 5 |
| 7 |
| 1 |
| 3 |
| 3 |
| 10 |
| 2 |
| 3 |
| 3 |
| 10 |
| 5 |
| 8 |
| 5 |
| 8 |
| 2 |
| 5 |
| 2 |
| 5 |
点评:掌握分数加减法计算法则是解决问题的关键.
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