а^2-1/3б^2*15б^3/а+1 =? При а = -2 , б=0.2
a^2-(1*15b^3)/(3b^2*a+3b^2*1)=
a^2-(15b^3)/(3ab^2+3b^2)=
a^2-5b/(a+1)=
(a^2-*a+a^2-*1-5b)/(a+1)=
(a^3-+a^2-5b)/(a+1)=a^2-5b/(a+1)
a^2-5b/(a+1) При а = -2 , б=0.2
(-2^2-5*0.2)/(-2+1)= (-2^2-5*2/10)/(-2+1)=
4-(5*2/10)/-1=4-(-1/-1)=4+1=5
ответ 5