Question

dau coroana rpd plz

Answer 1

Rezolvarea este anexata.

Answer 2

a)

( 3 - √2 ) ( 3 + √2 ) + ( √7 - 1 ) ( √7 + 1 ) = 3² - √4 + √49 - 1² = 9 - 2 + 7 - 1 = 13

b)

( 2 - √3 ) ( 2 + √3 ) - ( √5 - 1 ) ( √5 + 1 ) = 2² - √9 - ( √25 - 1²) =

= 4 - 3 - 5 + 1 = 1 - 5 + 1 = - 4 + 1 = - 3

c)

( 2√5 - 1 ) ( 2√5 + 1 ) + ( 7 + √13 ) ( 7 - √13 ) =55

= 4√25 - 1 + 7² - √13² =

= 4 × 5 - 1 + 49 - 13 =

= 20 - 1 + 36 =

= 19 + 36 =

= 55

_____________

d)

( 1 + 3√7 ) ( 1 - 3√7 ) - ( √17 + 4 ) ( √17 - 4 ) =

= 1 - 9 √7² - ( 17 - 4²) =

= 1 - 9 × 7 - 17 + 16 =

= 1 - 63 - 1 =

= - 62 - 1 =

= - 63