题目内容
计算:
+
+
+
.
| 1 |
| 3 |
| 1 |
| 15 |
| 1 |
| 35 |
| 1 |
| 63 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:先计算
+
的和,因为
=
×
,
×
=
,运用乘法的分配律把
+
进行整理,再进行计算即可.
| 1 |
| 3 |
| 1 |
| 15 |
| 1 |
| 35 |
| 1 |
| 7 |
| 1 |
| 5 |
| 1 |
| 7 |
| 1 |
| 9 |
| 1 |
| 63 |
| 1 |
| 35 |
| 1 |
| 63 |
解答:
解:
+
+
+
=
+
+
×(
+
)
=
+
×
=
+
=
+
=
=
| 1 |
| 3 |
| 1 |
| 15 |
| 1 |
| 35 |
| 1 |
| 63 |
=
| 5 |
| 15 |
| 1 |
| 15 |
| 1 |
| 7 |
| 1 |
| 5 |
| 1 |
| 9 |
=
| 6 |
| 15 |
| 1 |
| 7 |
| 14 |
| 45 |
=
| 6 |
| 15 |
| 2 |
| 45 |
=
| 18 |
| 45 |
| 2 |
| 45 |
=
| 20 |
| 45 |
=
| 4 |
| 9 |
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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