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yasima2

金虫 (小有名气)

[求助] 额...(a,b)=1

怎么证明若a,b互质,则存在整数m,n,使am+bn=1成立.
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yasima2

金虫 (小有名气)

soliton923: 马甲!!!! 2011-09-26 22:36:43
引用回帖:
2楼: Originally posted by lizhmath at 2011-09-26 17:51:22:
可以利用带余除法(欧氏辗转相除法):设
a=b q1+r1, 0<r1<b
b=r1 q2 +r2, 0<r2<r1
r1=r2 q3+r3,0<r3<r2
...
r_(n-2)=r_(n-1) q_n+r_n, 0<r_n<r_(n-1)
r_(n-1)=r_n q_(n+1)
则(a,b)= ...

3q,回去给你bb~
3楼2011-09-26 19:55:27
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lizhmath

金虫 (初入文坛)

【答案】应助回帖

soliton923: 谢谢参与讨论~~十分详细~~!!! 2011-09-26 22:36:32
yasima2(金币+5): 2011-09-27 16:07:24
可以利用带余除法(欧氏辗转相除法):设
a=b q1+r1, 0 b=r1 q2 +r2, 0 r1=r2 q3+r3,0 ...
r_(n-2)=r_(n-1) q_n+r_n, 0 r_(n-1)=r_n q_(n+1)
则(a,b)=(b q1+r1,b)=(b,r1)=(r1 q2+r2,r1)=(r1,r2)=...=(r_(n-1),r_n)=r_n
所以r_n=1.这时
1=r_n=r_(n-2)-r_(n-1)q_n=r_(n-2)-(r_(n-3)-r_(n-2)q_(n-1))q_n=...=a m+b n.
2楼2011-09-26 17:51:22
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