先化简,再求值:
,其中x=
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ccbe8d8b39ef6873eb3329e261ddde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
更新时间:2021-08-21 17:21:50
|
相似题推荐
解答题-计算题
|
较易
(0.85)
【推荐1】阅读下列材料,然后解答问题:在进行二次根式的化简与计算时,我们有时会遇到如:
,
,
一样的式子,其实我们还可以将其进一步化简:
;
;
;以上这种化简的步骤叫做分母有理化.
还可以用以下方法化简:
请参照以上方法化简,并直接写出结果:(1)
;(2)
;(3)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6ea3f90c1010e1f034a64d02d42d6b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8c77aeadd0addfc653118cc36e0e518.png)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04e075b45121e52ae84cb33fcf3c4114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1abce8678228ae50f36ce3e1c479beb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f6d7b69b454f0a51548dd8a3482174a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4f76e24d419e5417c9c01e89d01db3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b3c7f451fb7a7745362491416a18346.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b49f267bc7f325d441fc4fbc65e66d0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f6d7b69b454f0a51548dd8a3482174a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd627216e99424e9d739d6dbd39ab5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/190858b3370f190b9c8c546fcf3ed377.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/445a6af3b7d0d874bd92a51c22bf2757.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6ea3f90c1010e1f034a64d02d42d6b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8c77aeadd0addfc653118cc36e0e518.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/465dbd97e72b500ffac52bd2f7aea55b.png)
您最近一年使用:0次