<span>{112=b1*(1+q+q^2)
{14=b1*q^3*(1+q+q^2)
q=(7/56)^(1/3) b1=112/(1+(7/56)^(1/3)+(7/56)^(2/3))
S(5)=S(6)-b1*q1^5
s(5)=126-112*(7/56)^(1/3)/(1+(7/56)^(1/3)+(7/56)^(2/3))</span>
(2x-y)(2x+y) = 4x^2 - y^2
Таблицы и графики 3-х функций во вложении
-18=а*3²
-18=9а
а=-18/9
а=-2
у=-2х²