38^2-17^2дробь47^2-19^2

Question

38^2-17^2дробь47^2-19^2

Answer 1

38²-17²=(38-17)(38+17)=21х55
47²-19²=(47-19)(47+19)=28х66
21х55/28х66=3х5/4х6=5/4х2=5/8