Odpowiedź:
a) √144 - √169 = √12² - √13² = 12 - 13 = - 1
b) 2√225 - √361 = 2√15² - √19² =2 * 15 - 19 = 30 - 19 = 11
c) ∛27 - 8 = ∛3³ - 8 = 3 - 8 = - 5
d) √(1 7/9) - 5 = √(16/9) - 5 = √(4/3)² - 5 = 4/3 - 5 = 1 1/3 - 5 = 1 1/3 - 4 4/3 =
= - 3 2/3
e) (3√64 - 2∛64)/2 = (3√8² - 2∛4³)/2 =(3 * 8 - 2 * 4)/2 = (24 - 8)/2 =
= 16/2 = 8
f) 3√289 - 7√81 = 3√17² - 7√9² = 3 * 17 - 7 * 9 = 51 - 63 = - 12
