题目内容
(
-
+
)-(
+
)
| 3 |
| 2 |
| 1 |
| 3 |
| 5 |
| 7 |
| 5 |
| 7 |
| 2 |
| 3 |
分析:根据题意,减去
与
和,等于连续减去
与
,然后再根据加法交换律和结合律进行计算即可.
| 5 |
| 7 |
| 2 |
| 3 |
| 5 |
| 7 |
| 2 |
| 3 |
解答:解:
(
-
+
)-(
+
),
=
-
+
-
-
,
=(
-
-
)+(
-
),
=
-
-
,
=
-(
+
),
=
-1,
=
.
(
| 3 |
| 2 |
| 1 |
| 3 |
| 5 |
| 7 |
| 5 |
| 7 |
| 2 |
| 3 |
=
| 3 |
| 2 |
| 1 |
| 3 |
| 5 |
| 7 |
| 5 |
| 7 |
| 2 |
| 3 |
=(
| 3 |
| 2 |
| 1 |
| 3 |
| 2 |
| 3 |
| 5 |
| 7 |
| 5 |
| 7 |
=
| 3 |
| 2 |
| 1 |
| 3 |
| 2 |
| 3 |
=
| 3 |
| 2 |
| 1 |
| 3 |
| 2 |
| 3 |
=
| 3 |
| 2 |
=
| 1 |
| 2 |
点评:四则运算,先弄清运算顺序,然后再进一步计算即可,能简算的要简算.
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