题目内容
(2006?沙坪坝区)
+
+
+
-
-
(
-
)×
.
| 4 |
| 11 |
| 2 |
| 5 |
| 7 |
| 11 |
| 1 |
| 5 |
| 9 |
| 7 |
| 5 |
| 6 |
| 1 |
| 6 |
(
| 13 |
| 7 |
| 13 |
| 8 |
| 7 |
| 13 |
分析:(1)根据加法的交换和结合律简算即可;
(2)根据减法的性质简算即可;
(3)根据乘法的分配律进行简算.
(2)根据减法的性质简算即可;
(3)根据乘法的分配律进行简算.
解答:解:(1)
+
+
+
=(
+
)+(
+
)
=1+
=1
;
(2)
-
-
=
-(
+
)
=
-1
=
;
(3)(
-
)×
=
×
-
×
=1-
=
.
| 4 |
| 11 |
| 2 |
| 5 |
| 7 |
| 11 |
| 1 |
| 5 |
=(
| 4 |
| 11 |
| 7 |
| 11 |
| 2 |
| 5 |
| 1 |
| 5 |
=1+
| 3 |
| 5 |
=1
| 3 |
| 5 |
(2)
| 9 |
| 7 |
| 5 |
| 6 |
| 1 |
| 6 |
=
| 9 |
| 7 |
| 5 |
| 6 |
| 1 |
| 6 |
=
| 9 |
| 7 |
=
| 2 |
| 7 |
(3)(
| 13 |
| 7 |
| 13 |
| 8 |
| 7 |
| 13 |
=
| 13 |
| 7 |
| 7 |
| 13 |
| 13 |
| 8 |
| 7 |
| 13 |
=1-
| 7 |
| 8 |
=
| 1 |
| 8 |
点评:完成本题要注意分析式中数据,灵活运用运算定律进行计算.
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