Question

22 si 23
................dau coroana​

Answer 1

Răspuns:

Explicație pas cu pas:

Answer 2

Salut! :)

22. a = 3 × [ ( - 1 )ⁿ - 5 × ( - 1 )²ⁿ ] + ( - 1 )ⁿ ^ ² + ³

Dacă n este par:

a = 3 × ( 1 - 5 × 1 ) - 1

a = 3 × ( 1 - 5 ) - 1

a = 3 × ( - 4 ) - 1

a = - 12 - 1 = - 13

Dacă n este impar:

a = 3 × ( - 1 - 5 × 1 ) + 1

a = 3 × ( - 1 - 5 ) + 1

a = 3 × ( - 6 ) + 1

a = - 18 + 1 = - 17

23. a) 8 × [ 9 + ( - 2 )( + 6 ) - ( - 12 ) ] + 23 =

8 × ( 9 - 12 + 12 ) + 23 =

8 × 9 + 23 =

72 + 23 = 95

b) [ ( - 5 )² × ( - 3 + 8 )⁴ × ( - 2 - 3 )⁵ ]⁷ : ( - 5 )⁷⁵ =

[ 5² × 5⁴ × ( - 5⁵ ) ]⁷ : ( - 5⁷⁵ ) =

[ 5⁶ × ( - 5⁵ ) ]⁷ : ( - 5⁷⁵ ) =

( - 5¹¹ )⁷ : ( - 5⁷⁵ ) =

( - 5⁷⁷ ) : ( - 5⁷⁵ ) = 5² = 25

c) 144 - ( - 13 )² - { 2 + 3 × [ - 4 - ( 5 - 9 ) ] } × ( - 3 ) + 5 =

144 - 169 - [ 2 + 3 × ( - 4 + 4 ) ] × ( - 3 ) + 5 =

- 25 - ( 2 + 0 ) × ( - 3 ) + 5 =

- 20 - 2 × ( - 3 ) =

- 20 + 6 = - 14