两个三位数写在一起形成了一个六位数.若这个六位数恰等于原来两个三位数乘积的整数倍,求这个六位数.
更新时间:2018-12-25 10:22:00
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适中
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解题方法
【推荐1】欧拉函数
(n)(n∈
)的函数值等于所有不超过正整数n,且与n互质的正整数的个数,例如:
(1)=1,
(4)=2.
(1)求
,
;
(2)令
,求数列
的前n项和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/858911660b233271d57b17e358232d45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96d12e7c6df1963f7716eeb7100772f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eedc878c19a374cbf7c73d1619ae4db8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ad85501aeb2a6c54dbf31126b31380b.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/469b99ef8bffbb7fac8f509d6822050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be66226404060a525a1bdf7faac8fbf2.png)
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【推荐2】证明:任一正整数N均可表示为
的形式,其中,
,p、q、u、v∈Z.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b04e801f0bc0e1da60f89fd71a61999b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a88e4cc2754cd1b3a2f26dc1e8cd267f.png)
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【推荐1】
,
,…,
;
,
,…,
是1,2,3,4,5,6,7,8,9,10,11的两种不同的排列.证明:
,
,…,
中至少有两个被11除所得的余数相同.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e84c30444f13d37ada78285dc4f83b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b715e7842b95f654f16056a7c7f2abe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13423c094861baf4b759b7f3d8c3c226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e84bbc85887baf2c01afa80b0d5cc24b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44bf502ada908ff97df03ff04ef0138f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/995c790e7e871eedc7e04e857521aafc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65538b4900714015667fdd9f84254ac5.png)
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