定义新运算“
”:对于任意实数a,b,都有
,其中等式右边是通常的加法、减法和乘法运算,例如
,若
为实数
是关于
的方程,则它的根的情况为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/958bd270a90b9fbe73d2951b97a2d3ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02bb4916ed3adc0219bfec6960aecfaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bea0a6ea36d629405ba34f299c62a3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7314f537f91538329aaa86b235514436.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/149cc2b83646528579a46d5ed2ee820e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
A.有一个实数根 | B.有两个相等的实数根 |
C.有两个不相等的实数根 | D.没有实数根 |
更新时间:2024-05-26 19:03:32
|
相似题推荐
单选题
|
较易
(0.85)
【推荐1】阅读理解:我们知道,引进了无理数后,有理数集就扩展到实数集:同样,如果引进“虚数”实数集就扩展到“复数集”现在我们定义:“虚数单位”,其运算规则是:
,
,
,
,
,
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5ca5b71d916ec0051eef9720c50314.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73be79c02db553929619d957187e2077.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecef2b146a0b0f714f77c4b90dd25d9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a0220732b8ff3dd998577bbc23252d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e24fd6b5fab2bc9287bddfd4b7b1397f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c93ecda344d904c32ed81629b9783ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fd26dc21eb38db75be49ee5515e4323.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24eac03042ffc173f9d06fe772e8d97d.png)
A.1 | B.![]() | C.i | D.![]() |
您最近一年使用:0次
单选题
|
较易
(0.85)
【推荐2】规定新运算:a⊙b=(a+b)÷(a﹣b),例如,1⊙2=(1+2)÷(1﹣2)=﹣3,计算:(﹣3)⊙(6⊙10)的结果是( )
A.﹣7 | B.7 | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
较易
(0.85)
【推荐1】下列一元二次方程中,没有实数根的是( )
A.![]() | B. ![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
较易
(0.85)
【推荐2】下列给出的四个命题,真命题的有( )个
①若方程
两根为1和-3,则
;
②若
,则
;
③若
,则方程
一定无实数根;
④若m为非负数,则
.
①若方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/807d62d0b5623b3bd3cb285560bf8436.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb1beec07792cbfc2f46de2aa151c5d6.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b33114eca1f9352eac79f55a28c7ca90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d132495879088163eca1604770cb52ac.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35645c5101543eb8f1b6978a0500d381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/807d62d0b5623b3bd3cb285560bf8436.png)
④若m为非负数,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3cb65230d62ceb26e000f6930868538.png)
A.4个 | B.3个 | C.2个 | D.1个 |
您最近一年使用:0次