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1 . (1)解不等式组:
(2)先化简,再求值:(
-
)÷
,其中x=
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/731bc155992954c7899fb0669576e594.png)
(2)先化简,再求值:(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b60b122e651b49f676e07bd8c815006f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a76241e782e13eeee7c187507778aecf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b05e238548dc202137a63d8b20ff277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
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2 . 解下列各题:
(1)解方程:
.
(2)求等比数列2,4,8,16,…前十项的和.
(1)解方程:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f53fd9d1dccf6b20066df5493b5698.png)
(2)求等比数列2,4,8,16,…前十项的和.
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名校
3 . (1)化简:
.
(2)求值:
.
(3)设
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9425b2d567b729467fec9498c183e32d.png)
(2)求值:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/349678bf311bf77582444d12907a4428.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5aca7f0097fc0562c40375ce6756d56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1bb6f1d6a053b78c221624885791f66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2893bd2a2299d8180f45494ba593d1.png)
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