Giua 2 duong thang phan biet a,b co the xay ra cac vi tri nao ?Moi truong hop hay ve hinh minh hoa
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goi ucln (4n+3,2n+3) la d(d thuoc N*)
<=>4n+3 chia het cho d,2n+3 chia het cho d
<=>2.(2n+3)-4n+3
<=>3 chia het cho d <=>d thuoc tap hop {1;3}
do 4n va 2n chan =>2n+3 va 4n+3 ko chia het cho3
=>d=1
<=>n thuoc tap hop 1,2

