b, chung to rang k ton tai 2 so tu nhien a va b thoa man a2 + b va b2 + a deu la so chinh phuong .
tim so tu nhien co tinh chat:so do cong 25 va so do tru 12 deu co ket qua la so chinh phuong
tim so tu nhien lon hon 0 sao cho tong
1!+2!+...+n! la so chinh phuong
b)tim 1 so co 4 chu so sao cho so do vua la s chinh phuong vua la so lap phuong
neu co so tu nhien n sao cho k =n^2 thi ta noi so k la so chinh phuong tim tat ca cac so ab saocho (ab+ba) la so chinh phuong
cho so tu nhien a gom 100 chu so va 1 so tu nhien b gom 50 chu so 2 chung minh ava b la hai so chinh phuong
tim so tu nhien n sao cho n^2 +3n la so chinh phuong
tim so tu nhien a lon nhat sao cho 156 + a va 420 - a deu la boi cua a
tim so tu nhien khac 0nho nhat sao cho tong 19 so tu nhien lien tiep:k+1;k+2;...:k+19 la 1 so chinh phuong
a)so sanh E=2018^99-1/2018^100-1 va F=2018^98/2018^99-1
b)Tim so nguyen to ab (a>b>0),biet ab-ba la so chinh phuong
c)Cho abc la so tu nhien co 3 chu so .Tim gia tri lon nhat cua A={abc/a+b+c}+1918