Lgx=lg(3²*6:√9)=lg(9*6:3)=lg18
x=18
(a - 0.3b)(a² + 0.3ab + 0.09b²) = (a - 0.3b)(a² + a*0.3b + (0.3b)² ) =
= a³ - (0.3b)³ = a³ - 0.027b³
(4x +1)(16x² - 4x + 1) = (4x + 1)( (4x)² - 4x*1 + 1²) =
= (4x)³ + 1³ = 64x³ + 1
<span>6.5 катангенс(3пи/2 - альфа) - 0.3 тангенс (пи+альфа)</span>
<span>6.5tga-0.3tga</span>
<span>6.5*(-10)-0.3*(-10)</span>
<span>-6.5+3=-3.5</span>
<span>Ответ -3.5</span>