Question

va rogg ajutoorr!!! E urgenttt​

Answer 1

Răspuns:

a=(3²¹ +3²⁰ +3¹⁹)/39

a=3¹⁹(3² +3¹+1)/39

a=3¹⁹·13/39 se reduce 13 si 39

a=3¹⁹/3

a=3¹⁸ =(3⁹)²este pp

______________

p = 3⁷¹·4⁶²

U(3¹) = 3

U(3²) = 9

U(3³) = 7

U(3⁴) = 1

71 = 17·4+3 => U(3⁷¹) = 7

U(4¹) = 4

U(4²) = 6

62 = 31·2 => U(4⁶²)=6

U(3⁷¹·4⁶²) = U(7·6)=2

ultima cifra este 2

_____________

7ˣ+7ˣ⁺²=2450

7ˣ(1+7²)=2450

50·7ˣ=2450

7ˣ=2450:50=245:5=49

7ˣ=49=>7ˣ=7²=>x=2