1 . 观察下列一组等式的化简然后解答后面的问题:
;
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/782ab35ee3f09bca8164ee8ac6a9f1a1.png)
(1)在计算结果中找出规律![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cef1f04f3a901c2e463333eb30efb50.png)
______ .(n表示大于0的自然数)
(2)通过上述化简过程,可知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aede0780cd0890f17c8e18c15253a3c4.png)
______
(填“
”、“
”或“
”);
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca7dfc99c3458346e404bcf9251c7f7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/947d79fc1d3830928d9ac389f5bf91ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/782ab35ee3f09bca8164ee8ac6a9f1a1.png)
(1)在计算结果中找出规律
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cef1f04f3a901c2e463333eb30efb50.png)
(2)通过上述化简过程,可知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aede0780cd0890f17c8e18c15253a3c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45b3483dfb1db5e62b0b2a8a08a1bea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392cdb9d30684cce244bef94b8d861b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7942da6c3fc4005256fb1458557c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
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2 . 阅读与观察:
(1)按照上面的规律填空:
①写出第四个算式: ;
②
.
(2)将上面的规律用含
(
为整数且
)的等式表示,并说明其结果为偶数.
…… |
①写出第四个算式: ;
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a45d406fc821ac6d0257a1b94f6b05ca.png)
(2)将上面的规律用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e167b43045b3297248e334c41c621b8f.png)
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3 . 观察下列计算:
第一个等式:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9161d8ad4f5e276a4091753c06290318.png)
第二个等式:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bda5d3e7f7425bfc05d921d7f0e63ed9.png)
第三个等式:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70109c43bfb8b239fc9b04b0f4c86f9a.png)
……
根据以上规律,完成下列问题:
(1)写出第四个等式: .
(2)猜想第 n个等式(用含 n的代数式表示),无需说明理由.
(3)计算:
第一个等式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9161d8ad4f5e276a4091753c06290318.png)
第二个等式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bda5d3e7f7425bfc05d921d7f0e63ed9.png)
第三个等式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70109c43bfb8b239fc9b04b0f4c86f9a.png)
……
根据以上规律,完成下列问题:
(1)写出第四个等式: .
(2)猜想第 n个等式(用含 n的代数式表示),无需说明理由.
(3)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fec8c1d36f56cdee909448aebb3a6b9.png)
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4 . 按一定规律排列的单项式:a,
,
,
,
,…,则第n个单项式为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc770aeaa7849c33931b47f0af647266.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37527a86e218e413783754789ae2d690.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74fc56ddac349846767c817c870274df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fadb2728af3ede9896270f5262f3097.png)
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5 . 观察下列各式的规律.
第1个等式:
.
第2个等式:
.
第3个等式:
.
(1)根据上述规律,直接写出第4个等式:________________.
(2)猜想满足上述规律的第
个等式,并证明其成立.
第1个等式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebd7006f54518b3bb2c6952b545febe2.png)
第2个等式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3184e389f98a25bf1cef2b7aca1ba7f7.png)
第3个等式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fac652f6106c9db9e561f5270f51c676.png)
(1)根据上述规律,直接写出第4个等式:________________.
(2)猜想满足上述规律的第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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6 . 观察下列各式的规律:①
;②
;③
;…;依此规律,若
;则m、n的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ba11b92e07368d3baedfb7ba9dffe32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04665937b31d67aed6860cba7354916f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6752cdb04e17cdb8fe17b9b0893e6cf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/962d49f8784d4fe121fa37c332f4e496.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2024-03-12更新
|
352次组卷
|
7卷引用:浙江省杭州市东城第二实验学校2022-2023学年七年级上学期期中数学试题
7 . 若
满足
,求直线
经过第一、二、三象限的概率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0c369cc36371cce6020357c6e190c4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8981ed1857bdbea648c253c42bd5398.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c93cf80d146f7c1e5db3c47986ed61d8.png)
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8 . 已知按规律排列的一列二次根式如下:
,
,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
(1)根据你发现的规律猜想第
个式子是多少![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32ca6fa9955690cec01db601e3abce0c.png)
(2)当
时,求它与前面所有的二次根式的积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35361e76a7c85d1886728c8d0200b234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cde029ac94c601540583c64bc48c17bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b4515f89a626f76189663da498cfa87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
(1)根据你发现的规律猜想第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32ca6fa9955690cec01db601e3abce0c.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ec5d76db9bd05547932966c9913dc2.png)
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9 . 一列数
,其中则
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56c6ce06c1cd6542d0bb2bedaf66b8cf.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8511b8c76db0ef633f0f8f1952d8d69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f9620eb59d6c59dff1af39dd2e63739.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56c6ce06c1cd6542d0bb2bedaf66b8cf.png)
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10 .
,
,
…,
.将以上等式两边分别相加得![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4d8d852a0be94ea44c8f69a2bc0bff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec1223c426ed8d4d49992decc159b845.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bf9b9cabc3ce3cd289ce963c288a3d9.png)
用你发现的规律解答下列问题
(1)猜想并写出:
___________;
(2)直接写出下列各式的计算结果:
①
_____________;
②
______________;
(3)探究并计算:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19dee83006aafbc5df90bf1b12da368e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b209e1b790dbc45cafedacf49fa79f6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7f4890678dc22224b4d23a8c38fbf11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bf08b83692dafaedde3bd1ad4b9fae7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4d8d852a0be94ea44c8f69a2bc0bff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec1223c426ed8d4d49992decc159b845.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bf9b9cabc3ce3cd289ce963c288a3d9.png)
用你发现的规律解答下列问题
(1)猜想并写出:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fc9197c2c308203bc7218bb6c8068a1.png)
(2)直接写出下列各式的计算结果:
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40389ee61c8f2c2134cf6627d046f6a6.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7a80956429fdda857c2bd77d8c8dfd4.png)
(3)探究并计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e78ba090c8b529729ff6311d15586e7e.png)
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