题目内容
“口算”对对碰
+
=
2+
=
+
+
=
3-
=
+
=
-
-
=
| 3 |
| 4 |
| 1 |
| 4 |
2+
| 4 |
| 9 |
| 1 |
| 7 |
| 3 |
| 7 |
| 5 |
| 7 |
3-
| 3 |
| 4 |
| 2 |
| 3 |
| 1 |
| 6 |
| 5 |
| 16 |
| 1 |
| 16 |
| 1 |
| 16 |
分析：根据分数加减法的计算方法进行计算．
解答：解：
+
=1
2+
=2
+
+
=
3-
=2
+
=
-
-
=
．
| 3 |
| 4 |
| 1 |
| 4 |
2+
| 4 |
| 9 |
| 4 |
| 9 |
| 1 |
| 7 |
| 3 |
| 7 |
| 5 |
| 7 |
| 9 |
| 7 |
3-
| 3 |
| 4 |
| 1 |
| 4 |
| 2 |
| 3 |
| 1 |
| 6 |
| 5 |
| 6 |
| 5 |
| 16 |
| 1 |
| 16 |
| 1 |
| 16 |
| 3 |
| 16 |
点评：口算时，注意运算符号和数据，然后再进一步计算．
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