(4-y)^2 – y(y+1)=
=(4-(-1/9))^2 - (-1/9)(-1/9+1)=
=(4+1/9)^2 - (-1/9)(8/9)=
=16+73/81 + 8/81=
=17
ответ:17
(4-y)^2 – y(y+1)=
=(4-(-1/9))^2 - (-1/9)(-1/9+1)=
=(4+1/9)^2 - (-1/9)(8/9)=
=16+73/81 + 8/81=
=17
ответ:17