若干个数,第一个数记为
,规定运算:
,
,
,
,…,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92876fb436db9b4e97dd42b3e1f713ca.png)
按上述方法计算:当
时,
的值等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32e7d442609a81957c4477f4baab5e90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a3eb6fe20233d61e3b23115690123f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ded90f62b5c2d2fb3a685d252c0e1468.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a92df99e2f2799933cc72cbf01546d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92876fb436db9b4e97dd42b3e1f713ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/882a6e8f86e28c2382ab50e2c8ab0c0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/352d9b76dcf639368fa68cae70149802.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea00d10c496ccacb5b25c9574d6cdb09.png)
A.![]() | B.![]() | C.![]() | D.3 |
2022·湖北鄂州·三模 查看更多[5]
2022年湖北省鄂州市鄂城区中考模拟数学试题河南省南阳市第二十一学校2022-2023学年八年级上学期第一次月考数学试题四川省内江市隆昌市方田中学2022-2023学年七年级上学期第二次月考数学试题(已下线)6.3实数重难点专项练习【十大题型】-2022-2023学年七年级数学下册同步精品课堂(人教版)四川省内江市隆昌市知行中学2022-2023学年七年级上学期第二次月考数学试题
更新时间:2022-09-11 00:04:28
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【推荐1】将
个数
,
,
,
记成
:定义
,则方程
的根的情况为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30ff1ebf50fe3800673a8d422c88c335.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc5fce27bfe8cda3de3d3b2c61204149.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d94b2156b8ab299a3f24093b9555cbeb.png)
A.有两个不相等的实数根 | B.有两个相等的实数根 |
C.没有实数根 | D.只有一个实数根 |
您最近一年使用:0次
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名校
【推荐2】已知对于数a、b、c、d,规定一种运算
=ad-bc,那么当
=25时,则
=( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f159b459dbd5a85c476a928872087167.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fb12ed53c8dae4fa571f24f90f6b8bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05d65363372c5aa7badca386dfcaf0ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96985465fb9d038ccea2bdaaa130dd8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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(0.65)
【推荐1】古希腊数学家把数1,3,6,10,15,21,…叫做三角形数,它有一定的规律性,若把一个三角形数记为a1,第二个三角形数记为a2,…第n个三角形数记为an,计算a2﹣a1,a3﹣a2,a4﹣a3,…,此推算,a100﹣a99=( )
A.99 | B.1 | C.101 | D.100 |
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【推荐2】观察下面的变形规律:
,
,
,
,…回答问题:若
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d842b2e150d723c948234ee36f4b6b0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b61dfa259a7cfab28fe63ff7d6211b1a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
A.100 | B.98 | C.1 | D.![]() |
您最近一年使用:0次