题目内容
观察下列式子:
=
;
=
;
=
…
则第n个式子是______.
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| 2 |
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| 3 |
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| 1 |
| 4 |
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则第n个式子是______.
第n个式子是
=
.
|
| 1 |
| n+1 |
|
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