Bai cuoi cung nha ban :
goi so chinh phuong thu nhat co dang la (2n)^2 ( n khac 0 ) , so chinh phuong thu hai la (2n+2)^2 ( m khac 0 ) .
theo de bai ta co :(2n)^2 -(2m)^2=(2n-2n-2)(2n+2n+2)=4(-1)(2n+1)
vay hieu binh phuong cua hai so chinh phuong lien tiep chi het cho 4
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