(1)计算:
.
(2)先化简,再求值:
,其中
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e667f0c9dda789f98c3ed3ba6be92a0.png)
(2)先化简,再求值:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9132fadd47bbcdc50ffe0f4730ea901.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cc12fed7a6f4777c0fccc896e624281.png)
更新时间:2021-05-22 10:26:42
|
相似题推荐
解答题-计算题
|
适中
(0.65)
名校
【推荐2】先化简
,然后从
的范围内选择一个合适的整数作为
的值代入求值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c3032a0e056c60c481d056316b6e117.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6798fefbc8cb484060f97ffcc5340036.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
解答题-计算题
|
适中
(0.65)
【推荐2】先阅读,后解答:
,
;像上述解题过程中,
与
、
与
相乘,积不含有二次根式,我们可将这两个式子称为互为有理化因式,上述解题过程也称为分母有理化.
(1)
的有理化因式是______;
的有理化因式是______
(2)将下列式子进行分母有理化:①
______; ②
______.
(3)类比(2)中②的计算结果,计算:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/830d540105d3d3fa8d38776b933d9b75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2102d9b248e8f1c4cc0e3eaa9dc077a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53204688086b1d0111e91cb49fa0ac61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a581f283460235482116fbe3ba41efe.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/619096595112f0340a43b756e114dd3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb344b0bcb06d3aa362300cfcd8374c.png)
(2)将下列式子进行分母有理化:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf094d8fc817347010461fb8284865fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddae19bb3afde7d149a7752f9e4c4ffc.png)
(3)类比(2)中②的计算结果,计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ac5caeb2d14dcaf74f212a6ba51ffc.png)
您最近一年使用:0次