(5a-7b)(5a+7b) = 25а² - 49b²
8√х+5√у-√х-11√у=(<span>8√х-√х)+(5</span>√у<span>-11√у)=7</span>√х-6√у
1.х+3= литров в другом ведре.
2.х-4 = литров в 3 ведре.
<span>3. х+(х+3)+(х-4)=3х-1 литров в трех ведрах</span>
1) 4а⁴ *( (-2)³*b²)²= 4a⁴*( -8 *b²)²=4a⁴* 64*b⁴= 256 *a⁴*b⁴ = (4*a*b)⁴
2) ( -x⁵ *y)³ * 6x³*y²= -x¹⁵*y³*6x³*y²= - 6x¹⁸y⁵
3) (-0.3a⁴b c³)² * 5a²c⁶=( 0.09*a⁸*b²*c⁶)* (5*a²*c⁶)= 0.45*a¹°b²c¹²
Cosx = 1/2;
x = ± arccos(1/2) + 2pik
x = ± pi/3+ 2pik, k ∈Z