名校
1 . 计算:
的结果是_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c567a309c78703e39a50036b6cad407.png)
您最近一年使用:0次
2 . 先化简,再求值:
,其中
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5db833ae89597f859ec75d32dc249079.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c451958bdb92d606ea49cc412b57f28.png)
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3 . (1)计算:
;
(2)化简:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7560dfafca9f84c3bb06c3d3e1cccfef.png)
(2)化简:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c4ddcfd654215fb6e734296bd043b2.png)
您最近一年使用:0次
2024-06-12更新
|
105次组卷
|
2卷引用:2024年江苏省无锡外国语学校中考数学一模试题
4 . (1)化简:
;
(2)解方程组:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a226286ce34fdf3a1e93bd4ca788af1c.png)
(2)解方程组:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e99112cb13053159b0fe2c728f842b2d.png)
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5 . 计算化简:
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3d8488895594690c8a93e1202450381.png)
(2)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ef933d74de7fa4fdc520f059b80b0d6.png)
(3)先化简,再求值:
,其中
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3d8488895594690c8a93e1202450381.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ef933d74de7fa4fdc520f059b80b0d6.png)
(3)先化简,再求值:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e53f0ff92965d46f1c1744eca79667f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d324b8cc99df14a6418e7d0f7b7d7436.png)
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6 . 计算:
(1)
;
(2)
;
(3)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db1e220e01ef9f246ccc777d61ff253f.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01d1f49dcbb8f6b41c01f272e9753e1d.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8a8e059e1de466b0270680a2cc5ae07.png)
您最近一年使用:0次
7 . 先化简,再求值:
,其中
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c8f3f81232d5627386dccfd822b8343.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f06408895febc126c2ae409e807349c.png)
您最近一年使用:0次
2024-06-10更新
|
261次组卷
|
2卷引用:江苏省江阴市澄要片2023-2024学年七年级下学期期中考试数学试题
8 . 与几何证明一样,代数推理也需要有理有据.请先完成第(1)题的填空,再完成第(2)题的证明.
(1)已知实数x,y满足
,求证
.
证明:∵
,
∴
(实数的加法法则),
(不等式的基本性质1).
∴
(①).
∵
(②),
∴
.
∴
(③).
(2)已知实数x,y满足
,求证
.(注:无需写出每步的依据.)
(1)已知实数x,y满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d229cbec798c9c278a9b5979cb38247.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba8073266cfa99b04190473d16b615a8.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d229cbec798c9c278a9b5979cb38247.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6fa0bb61ce60310f18cb95bf2e83c8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb9873dfaf15e799fa6fb0128433725.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be487f86d23ca6027e19c8fccc5aa992.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c61f51f0956345e4381e4a86982c551.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43db43c7452258a0d37f8b9ee9c69180.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba8073266cfa99b04190473d16b615a8.png)
(2)已知实数x,y满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d229cbec798c9c278a9b5979cb38247.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d168aaaa03c5eeff1b2ebdd688346af6.png)
您最近一年使用:0次
9 . (1)计算:
(2)化简:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/469b33f4a369b57c0b5ec84b03a91c4c.png)
(2)化简:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b791ea315c91d3a99a25ef9618e4b90.png)
您最近一年使用:0次
10 . 下列运算正确的是( )
A.![]() | B.![]() |
C.![]() | D.![]() |
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