题目内容
计算:1-
-
-
-
-
.
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 32 |
考点:分数的巧算,分数的四则混合运算
专题:计算问题(巧算速算)
分析:从第三项开始,把每个分数拆成两个分数相减的形式,通过加减相互抵消,求得结果.
解答:
解:1-
-
-
-
-
=1-
-(
-
)-(
-
)-(
-
)-(
-
)
=1-
-
+
=
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 32 |
=1-
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 16 |
| 1 |
| 32 |
=1-
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 32 |
=
| 1 |
| 32 |
点评:完成此题,注意分数的拆分,通过加减相互抵消,解决问题.
练习册系列答案
相关题目