题目内容
简便计算．
+
-
+
+
+
-
-（
+
）-
．
| 5 |
| 9 |
| 2 |
| 7 |
| 5 |
| 9 |
| 5 |
| 7 |
| 1 |
| 4 |
| 3 |
| 8 |
| 5 |
| 8 |
| 1 |
| 4 |
| 17 |
| 8 |
| 2 |
| 3 |
| 7 |
| 8 |
| 1 |
| 3 |
分析：运用加、减法的运算性质进行简算．
解答：解：
+
-
+
=
-
+(
+
)
=0+1
=1；
+
+
-
=
-
+(
+
)
=0+1
=1；
-（
+
）-
=
-
-(
+
)
=
-1
=
=
．
| 5 |
| 9 |
| 2 |
| 7 |
| 5 |
| 9 |
| 5 |
| 7 |
=
| 5 |
| 9 |
| 5 |
| 9 |
| 2 |
| 7 |
| 5 |
| 7 |
=0+1
=1；
| 1 |
| 4 |
| 3 |
| 8 |
| 5 |
| 8 |
| 1 |
| 4 |
=
| 1 |
| 4 |
| 1 |
| 4 |
| 3 |
| 8 |
| 5 |
| 8 |
=0+1
=1；
| 17 |
| 8 |
| 2 |
| 3 |
| 7 |
| 8 |
| 1 |
| 3 |
=
| 17 |
| 8 |
| 7 |
| 8 |
| 2 |
| 3 |
| 1 |
| 3 |
=
| 10 |
| 8 |
=
| 2 |
| 8 |
=
| 1 |
| 4 |
点评：此题考查的目的是理解掌握加、减法的运算性质，并且能够灵活运用加、减法的运算进行简便计算．
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