A={1980;1990;1991;1992;1993:...:2005}
Hok tốt
k mk nha
A={1980;1981;1982;.....;2003;2004;2005}
chỉ 1 số thui
olympic mà
\(A=\left\{x\in N\backslash1980\le x\le2005\right\}\)
=> A \(\in\){ 1980,1981,1982,1983,1984,1985,1986,1987,1988,1989,1990,1991,1992,1993,1994,1995,1996,1997,1998,1999,2000,2001,2002,2003,2004,2005 }
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