Question

[Nguyen Ha My]

chung minh rang trong ba so nguyen lien tiep thi binh phuong cua so o giua hon tich cua hai so kia mot don vi

Answer 1

[school]

goi 3 so nguyen lien tiep la k-1,k,k+1

Ta co (k-1)*(k+1)=k*(k+1)-1*(k+1)=k^2+k-k-1=k^2-1

Vay tong 3 so nguyen lien tiep thi binh phoung cua so o giua hon h cua hai so kia mot don vi