Goi \(d\in UC\left(12n+1;30n+2\right)\)
\(\Rightarrow\) 12n+1 chia het cho d;30n+2 chia het cho d
\(\Rightarrow\)5(12n+1) chia het cho d;2(30n+2) chia het cho d
\(\Rightarrow\)60n+5 chia het cho d;60n+4 chia het cho d
\(\Rightarrow\)60n+5-60n-4 chia het cho d
\(\Rightarrow\) 1 chia het cho d \(\Rightarrow d\in U\left(1\right)\)
ma \(U\left(1\right)=\left\{1\right\}\Rightarrow d=1\)
Vay 12n+1 va 30n+2 la 2 so nguyen to cung nhau
Hay \(\frac{12n+1}{30n+2}\) la phan so toi gian
Tick cho minh nha Nguyen Huu Cuong
Minh la nguoi giai nhanh nhat do
khong tick thi minh hack duoc mat khau cua ban day khong tin cung duoc nhung ban se phai hoi han day
kho..................lam............................tich,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,minh..........................troi........................ret............................wa.................ung ho minh.................hu....................hu..............hu................hat..............hat....................s
kho..................lam............................tich,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,minh..........................troi........................ret............................wa.................ung ho minh.................hu....................hu..............hu................hat..............hat....................ung ho minhnha
bai thi .....................kho..........................kho..............troi.................thilanh.............................ret..................wa.........................dau................wa......................tich....................ung.....................ho.....................cho............do.................lanh
bai thi .....................kho..........................kho..............troi.................thilanh.............................ret..................wa.........................dau................wa......................tich....................ung.....................ho.....................cho............do.................lanh