题目内容
| 4 |
| 3 |
| 4 |
| 9 |
| 4 |
| 27 |
| 4 |
| 81 |
| 4 |
| 243 |
| 4 |
| 729 |
S=
+
+
+
+
+
①，
则3S=1+
+
+
+
+
②，
②-①得：
2S=1-
=
，
S=
；
则
+
+
+
+
+
，
=（
+
+
+
+
+
）×4，
=
×4，
=
．
故答案为：
．
| 1 |
| 3 |
| 1 |
| 9 |
| 1 |
| 27 |
| 1 |
| 81 |
| 1 |
| 243 |
| 1 |
| 729 |
则3S=1+
| 1 |
| 3 |
| 1 |
| 9 |
| 1 |
| 27 |
| 1 |
| 81 |
| 1 |
| 243 |
②-①得：
2S=1-
| 1 |
| 729 |
| 728 |
| 729 |
S=
| 364 |
| 729 |
则
| 4 |
| 3 |
| 4 |
| 9 |
| 4 |
| 27 |
| 4 |
| 81 |
| 4 |
| 243 |
| 4 |
| 729 |
=（
| 1 |
| 3 |
| 1 |
| 9 |
| 1 |
| 27 |
| 1 |
| 81 |
| 1 |
| 243 |
| 1 |
| 729 |
=
| 364 |
| 729 |
=
| 1456 |
| 729 |
故答案为：
| 1456 |
| 729 |
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