阅读材料:
像
、
、
……两个含有二次根式的代数式相乘,积不含有二次根式,我们称这两个代数式互为有理化因式.例如
与
,
与
,
与
等都是互为有理化因式.
在进行二次根式计算时,利用有理化因式,可以化去分母中的根号.
例如:
;![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fbd2c81bb306bdb48387e5565782ef.png)
解答下列问题:
(1)
与 互为有理化因式,将
分母有理化得
(2)计算:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39e5f88ee882a0908194fa93da7d9a59.png)
(3)观察下面的变形规律并解决问题:
①
,
,
,
……若
为正整数,请你猜想
②计算:
像
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55d1ab47c97e7076d971e14914d8a6b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc8b53dc29f3e6fd05c2a7843aa00f57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a270d3557289cce98a1bd2cca10a34bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f190b17530d81d927c358ac84757a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c34e01955f8c8fe2f0041b35d8d602a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c29a3e8e0a793b8ae0895e47a87b0627.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d651a249d8ee81dc6e9070791156da4.png)
在进行二次根式计算时,利用有理化因式,可以化去分母中的根号.
例如:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18155b34609b4836e0344de16c886ea2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fbd2c81bb306bdb48387e5565782ef.png)
解答下列问题:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a83c5ff6e8d90076a5f9ffa6a7fac69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ab468f1d9b0c885344393739b5bd746.png)
(2)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39e5f88ee882a0908194fa93da7d9a59.png)
(3)观察下面的变形规律并解决问题:
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f46d2748c9411018b3bb2134cbd662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca84e2db65efe3647aba894f55071678.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b76a425906a6acab27fbd1b3a06173.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb9fe72d3a9110de44f9f60f3f3d81da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cef1f04f3a901c2e463333eb30efb50.png)
②计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8b036e3d430ea9afb4e6f21bdb2d0e7.png)
更新时间:2019-07-11 13:39:43
|
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解答题-问答题
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适中
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名校
【推荐1】在数学小组探究学习中,张兵与他的小组成员遇到这样一道题:
已知
,求
的值.他们是这样解答的:
∵
,
∴
,
∴
,即
,
∴
,
∴
.
请你根据张兵小组的解题方法和过程,解决以下问题:
(1)
,则
.
(2)若
,求
的值.
已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80236b37de6f299b5ff05d1ff29850c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f3dac8de3d898f0dca07d13691f7140.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2edcd77b343d887fb5b466c2297039f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/781e8ee34a1141016f96356a0f5726d7.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d552d4566b2a1e8818b01b5290ab0a05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab0305b24ae0c310772b0a93f3d92161.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6601c927f4fa7028557c1f1b128cc2d.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c5be5b0ff35f61af7a1ac0a2f486141.png)
请你根据张兵小组的解题方法和过程,解决以下问题:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c804a5e2d8060aa5980d2f8dd0560386.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/877a107913ecabaa6599e6f41a5f73bb.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61e60c71c305d45fd2856cea4e41d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faf333a79a9795aa009d97f279b3ee2d.png)
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