题目内容
七根竹竿排一行,第一根长1米,其余每根竹竿的长都是前一根的一半,问:这七根竹竿总长是几米?
1+1×(
)1+1×(
)2+1×(
)3+1×(
)4+1×(
)5+1×(
)6,
=1+
+
+
+
+
+
,
=1+
+
+
+
+
+
,
=1+
,
=1
(米).
答:这七根竹竿总长是1
米.
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
=1+
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 32 |
| 1 |
| 64 |
=1+
| 32 |
| 64 |
| 16 |
| 64 |
| 8 |
| 64 |
| 4 |
| 64 |
| 2 |
| 64 |
| 1 |
| 64 |
=1+
| 63 |
| 64 |
=1
| 63 |
| 64 |
答:这七根竹竿总长是1
| 63 |
| 64 |
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