(1)计算:
(2)已知
,求x的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2258432de299c76cfbd5f94c15a6426.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fc191eec8eac0006a9e26d46ebb18b9.png)
更新时间:2022-08-09 13:41:30
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】观察被开方数
的小数点与算术平方根
的小数点的移动规律:
(1)填空:x= _______.
(2)根据你发现的规律填空:
①已知
≈1.414,则
________,
_______;
②
= 0.274,记
的整数部分为
,则
=___________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d012d124f04963fb72a68af40d5f8f42.png)
a | 0.0001 | 0.01 | 1 | 100 | 10000 |
![]() | 0.01 | x | 1 | 10 | 100 |
(2)根据你发现的规律填空:
①已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/517a1afb186ccc8d40375782dd1a1bc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59f1a1a1b7b536c61a2c2443865a0062.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a84dba41a7a4a57ca08a148e35e6971e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a9b201cabb7c0d1f1310a5264cf0e3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ab55a73bda23f8f84405801f8996fc8.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐3】【课本再现】据说,我国著名数学家华罗庚在一次出国访问途中,看到飞机上邻座的乘客阅读的杂志上有一道智力题:一个数是
,要求它的立方根.华罗庚脱口而出:
.邻座的乘客十分惊奇,忙问计算的奥妙,华罗庚讲述了下列的计算过程:
第一步:因为
,
,
,
.所以
的立方根是两位数;
第二步:因为
的个位上的数是
,而在
~
中,只有
的立方的个位上的数是
,所以
的立方根的个位上的数是
;
第三步:划去
后面的三位
得到数
,而
,
,
,所以
的十位上的数是
.
综上,可得
.
【方法迁移】
第一步:
,
,则
的立方根是________位数;
第二步:
个位上的数字是
,则
的立方根个位上的数字是________;
第三步:如果划去
后面的三位“
”得到数
,而
,
,由此可确定
的立方根十位上的数字是________,因此
的立方根是________.
【解决问题】
(1)将上述过程补充完整;
(2)现在换一个数
,你能按这种方法得出它的立方根吗?如果能,请求出它的立方根,并写出必要的推理过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/759588fbfe64e39bd6f12ce9ca01fc7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdc1750c8af2e75db49e0ebe1efbae15.png)
第一步:因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abad0be7978c58988e9c1fcc9da7c26c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a15ff967c8875b69e86e44092ea58af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8489da3c5ae73fd054eb4737dda9c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/276d4162a3c339720800e4ba8ef9b9ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/129d2a273c6705608b8dc65c790c4569.png)
第二步:因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/129d2a273c6705608b8dc65c790c4569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d02ea8c4988c5c28ab93f0d70fb55a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d02ea8c4988c5c28ab93f0d70fb55a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d02ea8c4988c5c28ab93f0d70fb55a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d02ea8c4988c5c28ab93f0d70fb55a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/129d2a273c6705608b8dc65c790c4569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d02ea8c4988c5c28ab93f0d70fb55a.png)
第三步:划去
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/129d2a273c6705608b8dc65c790c4569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb66384c0e6c341a17ff718537faa98a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8322a79d80b8ce88ef067845a357d003.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a52685b77856d28af3beed027d725506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c19ad8f64e2fa6efccc3802b89117144.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d9313b7d8dd115e1c3feb09d4939569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f448dd85b99184bc1e5b18642368bf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
综上,可得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d0cc0e783146f8ad858cc68e518f07b.png)
【方法迁移】
第一步:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abad0be7978c58988e9c1fcc9da7c26c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a15ff967c8875b69e86e44092ea58af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7173b6597c09a9d6b6366cd7e301ad2d.png)
第二步:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7173b6597c09a9d6b6366cd7e301ad2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7173b6597c09a9d6b6366cd7e301ad2d.png)
第三步:如果划去
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7173b6597c09a9d6b6366cd7e301ad2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfa249177389c400058085f68735a95c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8d4cb09f73abcf5c0d93c6644d362af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feae878a430a1b23774127547d842cb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a52685b77856d28af3beed027d725506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7173b6597c09a9d6b6366cd7e301ad2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7173b6597c09a9d6b6366cd7e301ad2d.png)
【解决问题】
(1)将上述过程补充完整;
(2)现在换一个数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29771a16e1addec26356058f5361e296.png)
您最近一年使用:0次