题目内容
(1
+2
+8
)÷(1
+2
+8
).
| 5 |
| 88 |
| 5 |
| 44 |
| 5 |
| 11 |
| 1 |
| 88 |
| 1 |
| 44 |
| 1 |
| 11 |
分析:把带分数化成整数加分数的形式,再根据加法交换律和结合律进行计算.
解答:解:(1
+2
+8
)÷(1
+2
+8
),
=(1+
+2+
+8+
)÷(1+
+2+
+8+
),
=[(1+2+8)+(
+
+
)]÷[(1+2+8)+(
+
+
)],
=[11+
]÷[11+
],
=11
÷11
,
=
.
| 5 |
| 88 |
| 5 |
| 44 |
| 5 |
| 11 |
| 1 |
| 88 |
| 1 |
| 44 |
| 1 |
| 11 |
=(1+
| 5 |
| 88 |
| 5 |
| 44 |
| 5 |
| 11 |
| 1 |
| 88 |
| 1 |
| 44 |
| 1 |
| 11 |
=[(1+2+8)+(
| 5 |
| 88 |
| 5 |
| 44 |
| 5 |
| 11 |
| 1 |
| 88 |
| 1 |
| 44 |
| 1 |
| 11 |
=[11+
| 5 |
| 8 |
| 1 |
| 8 |
=11
| 5 |
| 8 |
| 1 |
| 8 |
=
| 93 |
| 89 |
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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