题目内容
计算：（+3
）+（-2
）+（-3
）+（-1
）+5
+5
．
| 2 |
| 5 |
| 7 |
| 8 |
| 5 |
| 12 |
| 1 |
| 8 |
| 3 |
| 5 |
| 5 |
| 12 |
考点：正、负数的运算
专题：运算顺序及法则
分析：根据正、负数的因数法则计算即可，注意加法交换律和加法结合律的使用．
解答：
解：（+3
）+（-2
）+（-3
）+（-1
）+5
+5
=3
-2
-3
-1
+5
+5
=（3
+5
）-(2
+1
)+(5
-3
)
=9-4+2
=7
| 2 |
| 5 |
| 7 |
| 8 |
| 5 |
| 12 |
| 1 |
| 8 |
| 3 |
| 5 |
| 5 |
| 12 |
=3
| 2 |
| 5 |
| 7 |
| 8 |
| 5 |
| 12 |
| 1 |
| 8 |
| 3 |
| 5 |
| 5 |
| 12 |
=（3
| 2 |
| 5 |
| 3 |
| 5 |
| 7 |
| 8 |
| 1 |
| 8 |
| 5 |
| 12 |
| 5 |
| 12 |
=9-4+2
=7
点评：此题主要考查了正、负数的运算．
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