题目内容
(2012?仙游县)应用上面的规律,直接写出下面试题的得数.
+
+
+
+
+
+
=
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 32 |
| 1 |
| 64 |
| 1 |
| 128 |
分析:
+
=
=1-
;
+
+
=
=1-
;…
+
+
+…+
=1-
(n是非0自然数);由此规律求解.
| 1 |
| 2 |
| 1 |
| 4 |
| 3 |
| 4 |
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 7 |
| 8 |
| 1 |
| 8 |
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 2n |
| 1 |
| 2n |
解答:解:
+
+
+
+
+
+
,
=1-
,
=
.
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 32 |
| 1 |
| 64 |
| 1 |
| 128 |
=1-
| 1 |
| 128 |
=
| 127 |
| 128 |
点评:本题是较复杂的运算,先通过计算部分算式找出规律,然后根据规律化简求解.
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