T = s/u = 500/22 = 250/11 часов
<span>2*x^3-3*x^2-4 = (2*x^2 + x + 2)(x - 2) = 0</span>
2(-1)+998+2*(-1 в квадрате)+998*(-1)= -2+1000+2-998=2
2)((3c-2d)(3c+2d))/(6cd(3c-2d))=(3c+2d)/
(6cd)=(3×(5/3)+2×(1/2))/(6×(5/3)×(1/2))= (5+1)/5=6/5
3)(6x(x+2y))/(5y×(x+2y))=6x/5y=(6×(2/3))/5×(-2/5)= 4/-2=-2
4)(x+3y)^2/(4x(x+3y))=(x+3y)/4x= ((-2/10)+3(-6/10))/4(-2/10)=5/2