Ответ:
(y2-3y-5(y2-3y+1)=
y2(y2-3y+1)-3y*(y2-3y+1)-5(y2-3y+1)=
4y²-6y²+2y-6y²+9y²-3y-10y+15y-5=
y²+2y-3y-10y+15y-5=
y²+4y-5
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Ответ:
(y2-3y-5(y2-3y+1)=
y2(y2-3y+1)-3y*(y2-3y+1)-5(y2-3y+1)=
4y²-6y²+2y-6y²+9y²-3y-10y+15y-5=
y²+2y-3y-10y+15y-5=
y²+4y-5