(0.2+5у)^3-(0.5+2у)^3-6у^2 при у=1/2

(0.2+5*1/2)^3-(0.5+2*1/2)^3-6*1/2^2=(0.2+2.5)^3-(0.5+1)^3-6*1/4=
(2.7)^3-(1.5)^3-1.5=
2.7*2.7*2.7-1.5*1.5*1.5-1.5=
19.683-3.375-1.5=14.808

ответ:14.808