题目内容
阅读理解题:求
+
+
的值可用下面的两种方法:
方法一
+
+
=
+
+
=
方法二通过画图1发现
+
+
的值等于1减去阴影部分的面积
,即
+
+
=1-
=
.
请你模仿上述两种方法求
+
+
+
+
的值.
用合理的方法求
+
+
+…+
的值.

| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
方法一
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 4 |
| 8 |
| 2 |
| 8 |
| 1 |
| 8 |
| 7 |
| 8 |
方法二通过画图1发现
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 8 |
| 7 |
| 8 |
请你模仿上述两种方法求
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 32 |
用合理的方法求
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 1024 |
(1)方法一:
+
+
+
+
,
=
+
+
+
+
,
=
;
方法二:通过画图2发现
+
+
+
+
的值等于1减去阴影部分的面积
,即:
+
+
+
+
,
=1-
,
=
.

图2
(2)
+
+
+…+
,
=1-
+
-
+
-
+…+
-
,
=1-
,
=
.
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 32 |
=
| 16 |
| 32 |
| 8 |
| 32 |
| 4 |
| 32 |
| 2 |
| 32 |
| 1 |
| 32 |
=
| 31 |
| 32 |
方法二:通过画图2发现
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 32 |
| 1 |
| 32 |
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 32 |
=1-
| 1 |
| 32 |
=
| 31 |
| 32 |
图2
(2)
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 1024 |
=1-
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 512 |
| 1 |
| 1024 |
=1-
| 1 |
| 1024 |
=
| 1023 |
| 1024 |
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