题目内容
(1)
+
-
(2)
×
+
÷
(3)(
-
)×88.
| 2 |
| 5 |
| 4 |
| 15 |
| 2 |
| 5 |
(2)
| 6 |
| 7 |
| 5 |
| 8 |
| 3 |
| 8 |
| 7 |
| 6 |
(3)(
| 7 |
| 11 |
| 3 |
| 8 |
分析:(1)根据加法交换律进行简算;
(2)根据乘法分配律进行简算;
(3)根据乘法分配律进行简算.
(2)根据乘法分配律进行简算;
(3)根据乘法分配律进行简算.
解答:解:
(1)
+
-
,
=
-
+
,
=
;
(2)
×
+
÷
,
=
×
+
×
,
=
×(
+
),
=
;
(3)(
-
)×88,
=
×88-
×88,
=56-33,
=23.
(1)
| 2 |
| 5 |
| 4 |
| 15 |
| 2 |
| 5 |
=
| 2 |
| 5 |
| 2 |
| 5 |
| 4 |
| 15 |
=
| 4 |
| 15 |
(2)
| 6 |
| 7 |
| 5 |
| 8 |
| 3 |
| 8 |
| 7 |
| 6 |
=
| 6 |
| 7 |
| 5 |
| 8 |
| 3 |
| 8 |
| 6 |
| 7 |
=
| 6 |
| 7 |
| 5 |
| 8 |
| 3 |
| 8 |
=
| 6 |
| 7 |
(3)(
| 7 |
| 11 |
| 3 |
| 8 |
=
| 7 |
| 11 |
| 3 |
| 8 |
=56-33,
=23.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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