1 . 先化简,再求值:
,其中
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4dc343edbf0338770f9dfd0367fb32b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
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2 . 先化简,再求值:
,其中
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a759f61d29fd7f848bf2d4d3943abbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73f0343ebff0787baf94dcf96b4f50e7.png)
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3 . 先化简再求值:
,请选择适当的a值带入求值,其中
且a为整数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62baec2c1a04900b4c02ec50d634491d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9326f212a0f18acc0d0b75c67a4d216f.png)
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4 . 先化简,再求值:化简
,并从
,1,3中选取一个合适的数作为a的值代入求值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c2a17e7f3534984cededf079c2a3f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
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5 . (1)
,
(2)先化简,再求值:
的值,其中
使分式
值为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e40c24cb72996c3695719f4475c72db5.png)
(2)先化简,再求值:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5d52f3565bb7e178d2006875a7e726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7298bae98ffb0120b596ada45ecea1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
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6 . (1)解不等式组
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3de19537e331c64eb1366efaf8a54e2.png)
(2)先化简,再求值
,其中
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3de19537e331c64eb1366efaf8a54e2.png)
(2)先化简,再求值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce58fbbadeb56f0d45ccc52d94aaab7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da322ac8867e8a47c6588601078abf18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3801b83079be9d9bc657f6820024172.png)
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7 . (1)计算:
.
(2)化简求值:
,其中
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b1b883ad5887892b9af08f15ca80ea.png)
(2)化简求值:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d371d96b91ce9260ce0f406f26d3cb65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2c9d44deafbbbb631c4c0db884c8874.png)
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8 . (1)计算
①
②![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0498481907100609d72383ace356d687.png)
③![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cf4f8944c48c628ec65b78a5548f1aa.png)
(2)先化简,再计算
,其中
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba01b895e39f93d6f4e8ee0824b6b6cb.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0498481907100609d72383ace356d687.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cf4f8944c48c628ec65b78a5548f1aa.png)
(2)先化简,再计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/823f889d239efd7714f6a51f3a7e037d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8120119749d4bc28067e73fca7d46cd.png)
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9 . 先化简,再求值:
,其中
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3510583beff50526020bf1d0d8996b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e2ad4acb740916f0d61ef3654b0410e.png)
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2024-04-28更新
|
346次组卷
|
2卷引用:2023年辽宁省辽阳市第二中学作校中考数学模拟预测题
名校
10 . (1)先化简,再求值:
,其中![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
(2)先化简,再求值:
,其中
满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03d0ecd43baf658b6bfc40923052a8c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
(2)先化简,再求值:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fe0c766ecedc0dee531dfd0632d81ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a678cd018f89c3518645bc8439805ce.png)
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