解下列方程:
(1)
;
(2)
;
(3)
;
(4)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a836c7f8009e5b85389301960d96b0a.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d9db284f56ed1260e700830e7e9205b.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4a52dda841deaf488bb944c68933a50.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80819cd188ed381e7bb44d00f2e5dcd7.png)
更新时间:2024-01-05 01:16:29
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相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】已知关于
的一元二次方程
有实数根.
(1)求
的取值范围;
(2)方程的两根为
、
,若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb8b0e5292687dc167706ef5a73cccc5.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)方程的两根为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5178a3c2d7cd3feeaf6640fe5ee568fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】解方程
,下面是甲、乙两同学的部分运算过程.
甲同学:
两边同除以
,
得
,
则
,
乙同学:
移项,得
,
提取公因式,得
,
则
或
,
解得
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac12f90931435d60f4b6879ab26f7a0b.png)
(1)解一元二次方程的基本思想是 .(填“降次”或“消元”)
(2)请判断他们的解法是否正确?若其中有一位同学正确,请写出一种异于该同学解法的正确解答过程;若都错误,请写出你认为正确的解答过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb161d45d1ada8d3a2d64366c1860f59.png)
甲同学:
两边同除以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a46740a94f426e5112d3bd108678df3f.png)
得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37230f1a4089aba8b20d4f458e33e93e.png)
则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da322ac8867e8a47c6588601078abf18.png)
乙同学:
移项,得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc5addf5cb2cea8fbf46ab5c869adf6c.png)
提取公因式,得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80ef9869c5d86b097cfe2f8f6073ae6b.png)
则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/815650356afb1f42207c27d3b11635f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec12a18deb545cf6e53b802e27fb622f.png)
解得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/754a5a4102094d0fc8a8c16c4fcd9bd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac12f90931435d60f4b6879ab26f7a0b.png)
(1)解一元二次方程的基本思想是 .(填“降次”或“消元”)
(2)请判断他们的解法是否正确?若其中有一位同学正确,请写出一种异于该同学解法的正确解答过程;若都错误,请写出你认为正确的解答过程.
您最近一年使用:0次