1. Lai Van Sam is a journalist in VTV. He is famous for hosting the TV show “Who wants to be a billionaire”. (Using Relative clause)

Cho b² = a*c, c² = b*d (với b, c, d khác 0), (b+c khác 0), (b²⁰¹⁷ + c²⁰¹⁷ khác d²⁰¹⁷). Chứng minh rằng a²⁰¹⁷ + b²⁰¹⁷ - c²⁰¹⁷ / b²⁰¹⁷ + c²⁰¹⁷ - d²⁰¹⁷ = (a + b- c)²⁰¹⁷ / (b + c -d)²⁰¹⁷.