A
akanam


cac' ban. Than^ ye^u o*i
giup' minh voi'
1. C/m: uoc' chung(a,b)=d ///// C/m d< (ca)n(a,b))/2
cac ban co hieu nha
chung minh rang d nho hon can a nhan b tat ca phan 2
giup' minh voi'
1. C/m: uoc' chung(a,b)=d ///// C/m d< (ca)n(a,b))/2
cac ban co hieu nha
chung minh rang d nho hon can a nhan b tat ca phan 2
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