0,75^(-2) - 1.5^(-3) -(-3)^0 = (3/4)^(-2) - (3/2)^(-3) - 1 = (4/3)^2 - (2/3)^3 - 1 =
= 16/9 - 8/27 - 1 = (48 - 8 - 27) / 27 = 13/27
Ответ. 13/27
А) 6х² - 3х = 0
6х² = 3х х² = 1/3 х = √1/3
б) 25х² - 81 = 0
25х² = 81 х² = 3,24 х = √3,24
в) 3х² - 7х - 6 = 0
D = (-7)² - 4·3·(-6) = 49 - 72 = 121 = 11² x1 = (7+11)/6 = 18/6 = 3; x2 = (7-11)/6 = -4/6 = -2/3.
Думаю, что ответ будет -7
(3√а+3√в)²-(3√а-3√в)²=(3√а+3√в+3√а-3√в)(3√а+3√в-(3√а-3√в))=
=6√а(3√а+3√в-3√а+3√в)=6√а*6√в=36√(ав)