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Ngu

흘르럏스헣 허줖

Như cặc

Đặt (3n+1,2n+1)=₫

=>(2(3n+1(,3(2n+1)=₫

=>(6n+2,6n+3)=₫=>6n+2...₫,6n+3...₫

=>6n+3-6n+2...₫=>1...₫=>₫=1

=>(3n+1,2n+1)=1 nên 3n+1,2n+1laf 2 snt cùng nhau

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