在进行二次根式化简时,我们有时会遇到形如
,
这样的式子可以用如下的方法将其进一步化简:
;
以上这种化简的方法叫做分母有理化.
(1)化简:①
= ,②
= ,③
= ;
(2)已知n是正整数,化简
= ;
(3)利用(2)的启示,请化简:
;
(4)联系与拓广:
,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47b1afaab4088ebe8dec23d57e1b364c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8cd845e7be7cbd32c557466df03adea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69982c14f7fb8f977177c0134ffd2f66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dace0b425b5b7b5d498beaf9901612.png)
(1)化简:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04e075b45121e52ae84cb33fcf3c4114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f32ec05de7b7cfde8e0904975fa3cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14373954372e53d36709aceca53be0f0.png)
(2)已知n是正整数,化简
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42388221a8b19545db7aa38fdf50d129.png)
(3)利用(2)的启示,请化简:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3f6133eea37159ff4d09415efbbdd5f.png)
(4)联系与拓广:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9221d54e33f379190a0295b08a82bd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
更新时间:2023-01-15 22:27:45
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解答题-计算题
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适中
(0.65)
【推荐1】(1)计算:(3xy2)2·2xy÷6x3y3;
(2)运用整式乘法公式进行简便运算:2021×2019+20202;
(3)先化简,再求值:2b2+(a+b)(a-b)-(a-b)2,其中a=-3,b=
.
(2)运用整式乘法公式进行简便运算:2021×2019+20202;
(3)先化简,再求值:2b2+(a+b)(a-b)-(a-b)2,其中a=-3,b=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
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