求下列各式的值:
(1)计算:
;
(2)若
,求
的值.
(1)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b575a55f0cd5710828a99c35cb425dff.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7730288fdd66fbc6ed4a7b75ac72b58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/757eb3f55cff1e6fef064db4efae9e28.png)
22-23高一上·四川成都·期中 查看更多[2]
更新时间:2023-06-26 14:36:03
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解答题-计算题
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【推荐1】我们知道平方运算和开方运算是互逆运算,如:
,那么
,那么如何将双重二次根式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79302e44ec001a6f493b466325e0e5aa.png)
化简呢?如能找到两个数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
,使得
即
,且使
即
,那么![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbb1bde24adb7d8c05a5de93cde6192c.png)
,双重二次根式得以化简;例如化简:
;
且
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a6226085bb84e5bb38b0d1d174cb1ab.png)
由此对于任意一个二次根式只要可以将其化成
的形式,且能找到
使得
,且
,那么这个双重二次根式一定可以化简为一个二次根式.请同学们通过阅读上述材料,完成下列问题:
(1)填空:
_________________;
__________________;
(2)化简:①
②![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b930cfb4e5f7f934fbfbb9c5d44aa580.png)
(3)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5de37d32eccdc451613ef70bf7b21ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1208fde2351fab3a8d1249c8883ecbe6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79302e44ec001a6f493b466325e0e5aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7960b91b265fea93557cb3233612a2ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ac536dc56e720243eca2f623a6b3c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd54c10269786647f7f58245568831c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18bf676b743728833d21db05f7d55a0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d9a2c28054fd8e9930214f498f90000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49674a98f036ba592c7eb60e0d3700f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbb1bde24adb7d8c05a5de93cde6192c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/416a07357190aaf89ba9d46ecf7f9726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93f52a49827b10ed69c411a4fc24b7ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ea1e842ea66797b4186b1999b64defe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9195069b3bba2b6fa60da9782a3a01b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a6226085bb84e5bb38b0d1d174cb1ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6adbf1ed6f3a94d47e1afd0fb5b91a52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79302e44ec001a6f493b466325e0e5aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd643708b722728b381f7ddc5518f92e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18bf676b743728833d21db05f7d55a0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49674a98f036ba592c7eb60e0d3700f5.png)
(1)填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6befb2396e904f04041bc022fc139383.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2bd8b15c5fbed51333f451fc960fcad.png)
(2)化简:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59273ede9ffcc5aa906533be4bc08d0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b930cfb4e5f7f934fbfbb9c5d44aa580.png)
(3)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f0343f24de9a473caebc6ad5ec3cc1e.png)
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解答题-问答题
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名校
【推荐1】对数的运算性质是数学发展史上的伟大的成就.
(1)对数运算性质的推导有很多方法,请同学们推导如下的对数运算性质:如果
,且
,
,那么
;
(2)因为
,所以
的位数为
(一个自然数数位的个数,叫做位数),试判断
的位数;(注:
)
(3)围棋和魔方都是能锻炼思维的益智游戏,围棋复杂度的上限约为
,二阶魔方复杂度上限约为
,甲、乙两个同学都估算了
的近似值,甲认为是
,乙认为是
.现有一种定义:若实数
,
满足
,则称
比
接近
,试判断哪个同学的近似值更接近
,并说明理由.(注:
,
,
)
(1)对数运算性质的推导有很多方法,请同学们推导如下的对数运算性质:如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2480f87a11c4cd450bc9454ea7276722.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8905be1335a8703769b0ad90eb6b1603.png)
(2)因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/debc5f7846c70bdfb5911af22b83558f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a5bdc4ab4fd3f97dc0fd63038015386.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/295ee20e2e288c6c0ea3a54733876a22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eec3c995225b61aec23e4a4e5489416.png)
(3)围棋和魔方都是能锻炼思维的益智游戏,围棋复杂度的上限约为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4f610f3ed73c02ddc0fd21b34d12ee2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76992e26e825328ac4195cdb64e940ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57584805a70c17d752bbd0def995accc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cc51142755442f117c9889e820bcebe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3025d924b323476fcc962dc6df6c9d36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86b2f36a11b3ee72115629252bcdbe61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57584805a70c17d752bbd0def995accc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82f4d8318aba2dd01bfdc4c6b77c6121.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fab1cb23df1e01a5120207dbfb4ae6c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f570a51c972c385489c7d3348be1cd6.png)
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