9. Calculaţi: a) (5³⁰:5¹⁷):(5²)⁵.5⁰

b) (2019¹ + 2019⁰ - 1²⁰²¹+ 0²⁰²¹ – 3.7): 16

c) 27² +3 . [(3⁷)⁹:+3³⁰+3.3²⁷-3³³]:9¹³

rapidd dau coroana​