题目内容
13
-(-
)+
-(-
).
| 5 |
| 6 |
| 3 |
| 4 |
| 5 |
| 6 |
| 7 |
| 12 |
分析:首先利用符号法则对式子进行化简,然后通分相加即可求解.
解答:解:原式=13
+
+
+
=
+
+
+
=
=
=16.
| 5 |
| 6 |
| 3 |
| 4 |
| 5 |
| 6 |
| 7 |
| 12 |
=
| 166 |
| 12 |
| 9 |
| 12 |
| 10 |
| 12 |
| 7 |
| 12 |
=
| 166+9+10+7 |
| 12 |
=
| 192 |
| 12 |
=16.
点评:本题主要考查有理数的异分母分数加减混合运算,通分是解题的关键.
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