Question

[nguyen huu phuong]

so sanh tong cua a vs b biet a=abc+de+1992

                                           b=19bc+d1+a9e

Answer 1

[Nguyễn Bảo My]

b=19bc+d1+a9e=1900+1+90+bc+d0+a00+e=1991+abc+de

            Vì 1992>1991=>a>b