8. n=430,432,434,436,438
9. 27²+3·[(3⁷)⁹:3³⁰+3·3²⁷-3³³]:9¹³=
=27²+3·(3⁶³:3³⁰+3·3²⁷-3³³):9¹³=
=27²+3·(3³³+3²⁸-3³³):9¹³=
=729+3(3³³+3²⁸-3³³):3²⁶=
=729+3·3²⁸:3²⁶=
=729+3·3²=
=729+3·9=729+27=756
Sper ca te-am ajutat!
