tim n de n^n+2n+12 la so chinh phuong
tim so nguyen n de n^2 +1986 la so chinh phuong
Tim n la so tu nhien de n2016 +1234 la so chinh phuong
tim n de n^2+2n+12 la so chinh phuong
tim n de n^2+2n+12 la so chinh phuong
tim n de n^2-2n+18 la so chinh phuong
tim n de n2+n+43 la so chinh phuong
tim so tu nhien n de n^2+2n+12 la so chinh phuong
tim cac stn n de Q=1!+2!+3!+....+n! la mot so chinh phuong.